• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Delta’s long term strategy and industry competitive dynamics:A case study of the Airline Industry

    2022-04-10 23:58:39ZimoLi
    速讀·中旬 2022年1期
    關(guān)鍵詞:佐治亞理工學(xué)院簡(jiǎn)介

    ◆Abstract:In this paper, we presented a holistic view of the airline industry. First, we narrowed our definition of the airline industry to only include three firms: Delta Air Lines, United Airlines and American Airlines, so we classify the market an oligopoly. Our Porter’s five forces analysis shows the large importance of the interdependence between firms in the market and the high barriers to entry, through which, we identified internal competition and power of buyers as the two most significant eroders of profit in the airline industry. The detailed analysis of Delta’s extent of horizontal and vertical integration shows that all three airlines were integrated horizontally to a similar degree. The main differentiator in terms of horizontal integration between the three is Delta’s innovative employee profit sharing plan. Finally, we analyzed how Delta’s choices towards horizontal and vertical boundaries have created competitive advantages for the firm and Delta’s revenue maximization strategy.

    ◆Keywords:Delta Airline; Airline Industry; Enterprise Strategy; Porter’s Five Forces

    1.Introduction

    Delta Air Lines, Inc. is one of the largest airlines in the world and one of the most recognizable brands in America. As one of the premier airlines both within the United States and internationally through its global SkyTeam partnership, Delta provides a high-quality product to an extremely wide range of destinations. This combination of quality and extensive service is only shared by two competitors: American Airlines and United Air Lines. The competitive dynamics of an oligopolistic market are much different than those of other market structures, and it will be helpful to consider the strategic choices of Delta through the lens of an oligopolistic market structure. Generally speaking, oligopolistic markets have high barriers to entry and firms in the market are very interdependent, meaning they take rival’s decisions into account when making theirs. (Agarwal, Prateek,2020) We will expand on these aspects of oligopoly and more when conducting a Porter’s five forces analysis of the airline industry.

    2.Five Forces Analysis of the Airline Industry

    The analysis below helps to reveal the competitive dynamics between Delta and its competitors and the airline industry overall. Furthermore, it will help us understand the factors which erode profits in the airline industry which will be particularly useful when we later examine Delta’s specific strategic choices.

    2.1 Internal Rivalry

    Internal rivalry between Delta, American and United is the main factor which erodes profits in the airline industry. Delta and its competitors offer flights, either directly or through their international partnerships, on almost all the same routes. This competition occurs both on a price level and a non-price level. On a non-price basis, Delta and its competitors compete on a quality basis and through various customer loyalty programs including multiple levels of price discrimination for different flying experiences and rewards programs both for repeat use of services and through partnerships with credit card companies.

    2.2 Threat of Entry

    Delta faces little threat of entry in terms of new competitors that could realistically match the scale and quality of its operation due to the considerable level of capital-intensity within the airline industry, the high degree of existing competition for gates at airlines and the economies-of-scale and experience Delta possesses (Wolla et al,2018).

    2.3 Availability of Substitutes/Complements

    Overall, the availability of substitutes is not a significant factor in eroding profit in the airline industry. There are no true substitutes to air travel for long-range trips. Additionally, there are no true complements to air travel. Delta and its competitors offer partnerships with credit card companies that help customers earn flight miles with other purchases, but this is a weak complement and does more to affect internal rivalry than complementary demand.

    2.4 Power of Suppliers

    Delta, United and American airlines are among the largest buyers of new aircraft from Boeing and Airbus globally(Gilbert&Nestor,2018).Boeing and Airbus are in such fierce competition that they cannot charge any of these three airlines in a way that would significantly erode profits without running the risk of losing business. Another important input into the airline industry is jet fuel. Jet fuel suppliers also typically do not erode industry profits in a significant way.

    2.5 Power of Buyers

    Overall, buyer power is a significant eroder of profit in the airline industry. Buyers hold significant power in the airline industry. Delta, United, and American all offer essentially identical products. Buyer concentration and volume are not significant factors. However, many airline buyers are extremely price elastic and are able to choose the cheapest supplier. Airlines have instituted customer loyalty programs which makes these business travelers, who are the gem of the airline industry, even more price inelastic (DePersio& Greg,2020).

    3.The analysis of Delta’s Market Penetration

    In 2019, Delta had a 17.5% share of the U.S. airline market and SkyTeam, Delta’s international partnership, held a 19% share of the global market. As a comparison, United held a 14.9% domestic market share and its international alliance, Star Alliance, held a 22% share of the global market. Finally American airlines had a 17.6% share of the domestic market and its international partnership OneWorld had a 15% share of the global market. Southwest, who we have identified as an emerging competitor to Delta, had a 14.9% share of the domestic market but an insignificant share of the global market. Clearly, all of the firms which we identified as direct competitors have deep market penetration both domestically and globally. Another factor to consider when assessing degree of market penetration is brand recognition. This factor can be hard to quantify, but in 2016 the Harris Poll named Delta the strongest brand in the travel industry (Savadelis&Liz,2016). This award shows that customers view Delta as a strong and quality brand and supports the fact that Delta has achieved a high level of market penetration.

    4. Delta’s Strategic Choices in Integration and Revenue Maximization

    Delta’s resurgence since 2005 has been a direct result of a combination of its long-term strategic plan both in choices concerning horizontal and vertical integration and in its treatment of the oligopolistic market that it operates in, as well as its pursuit of a benefit leadership strategy as a way to distinguish itself from major competitors in the eyes of consumers. At every level of the vertical and horizontal chain, firms are left with a choice: make or buy. Large, complex multinational airlines like Delta have to make this make or buy decision and many points along its chain. First, we will discuss agency and technical efficiency of Delta and its competitors in terms of horizontal boundaries. Then, we will discuss them in terms of vertical boundaries and how Delta ultimately forms a competitive advantage.

    4.1 Horizontal Boundaries

    The horizontal boundaries of the airline are pretty intuitive. Essentially all of Delta’s operations relate directly to providing airline services for passengers and cargo. Delta’s goal in this regard since emerging from bankruptcy has been to continuously expand its flight offerings and size of the airline. In pursuit of these goals, Delta has merged with Northwest Airlines, entered into partnerships with LATAM, Air France, Virgin Atlantic and KLM and bought minority stakes in AeroMexico and Hanjin-KAL. All of these moves have expanded Delta’s scale, scope and market share. These partnerships, known collectively as SkyTeam, significantly improve agency efficiency in terms of Delta’s ability to offer more flight path options and destinations through these many partnerships. These partnerships considerably reduce Delta’s transaction and contracting costs of arranging these flight agreements for every individual route with different airlines.

    4.2 Vertical Boundaries

    Delta has taken greater efforts to integrate vertically than other airlines. This has the general effect of lowering agency costs while increasing technical costs. Delta’s purchase of the Trainer oil refinery in Pennsylvania was a major move towards backwards integration. The move was designed to insulate Delta from fluctuations in jet fuel prices as well as ensure a steady supply of jet fuel to Delta’s northeast hubs in New York. It allowed Delta to reduce agency costs that result from negotiating jet fuel supply deals with third party refineries and distributors. On the other side, it increased Delta’s technical costs and required Delta’s leadership to learn how to operate a refinery business. In 2014, Delta made another move to improve its agency efficiency by reintegrating its reservations and flight operations systems at the price of increased technical costs (Rice&Kate,2014). Like the Trainer refinery, none of Delta’s competitors have integrated their reservations systems, opting instead to use third party companies. The final push towards vertical integration that Delta has pursued is Delta TechOps.

    4.3 Competitive Advantage and Revenue Maximization Strategy

    Delta’s competitive advantage is evidenced by its ability to consistently maintain higher margins than its competitors. Delta’s net profit margin in 2019 was 10.14% compared to 9.56% for United and 3.68% for American. First, Delta owns the Monroe Refinery, giving them roughly a 5 cents per gallon cost advantage on jet fuel. Delta also focuses heavily on attracting business travelers, which offer higher margins and the market for business passengers is less prone to price fluctuation. Through excellent customer service, delta successfully maintains and grows its customer base, and also partners with firms like American Express to succeed even further in its pursuit for business travelers. Additionally, it is important to note that the world’s busiest airport, Hartsfield-Jackson in Atlanta, is dominated by Delta. Potentially its most important source of competitive advantage is that Delta buys many used planes, while most competitors purchase new ones. Delta has managed to shift even more of its fixed costs to variable through its employee profit-sharing plan. This plan has kept Delta’s number of union workers extremely low relative to the industry. This allows Delta to offer lower base salaries than other airlines and shift this fixed cost to the variable cost of the profit-sharing agreement (Anderson & Richard H,2015).

    5.Conclusion

    In this paper, we presented a holistic view of the airline industry. First, we narrowed our definition of the airline industry to only include three firms: Delta Air Lines, United Airlines and American Airlines. From this industry definition, we were able to confidently classify the market an oligopoly. Our Porter’s five forces analysis clearly supported this market definition, showing the large importance of the interdependence between firms in the market and the high barriers to entry. Also from the five forces analysis, we identified internal competition and power of buyers as the two most significant eroders of profit in the airline industry.

    Armed with this understanding of the market forces affecting the airline industry, we then performed a detailed analysis of Delta’s extent of horizontal and vertical integration and how these compared to American and United. We found that all three airlines were integrated horizontally to a similar degree. The main differentiator in terms of horizontal integration between the three is Delta’s innovative employee profit sharing plan through which it has managed to keep its employee unionization rates significantly lower than the industry average. As for vertical integration, we found that Delta is vertically integrated to a much higher degree than its competitors. This extent of vertical integration includes owning the Trainer oil refinery to produce jet fuel, controlling its own reservations and flight operations systems and operating its own MRO operations. This level of vertical integration affords Delta greater control over the quality of its product which is an important strategic differentiator for the company.

    From there, we analyzed how Delta’s choices towards horizontal and vertical boundaries have created competitive advantages for the firm and Delta’s revenue maximization strategy. Our main finding was that Delta puts intense focus on a benefits leadership strategy. To this end, they seek to deliver an extremely high-quality product. To accomplish this, Delta has put an intense focus on customer service by having industry-leading customer loyalty programs, in-flight service, world-class airport lounges and more. Although Delta pursues a benefits leadership strategy, it still seeks to constrain costs in its efforts to maximize revenue. In consideration of that, Delta has used its Trainer refinery to keep down jet fuel prices, reduced cost of wages through its profit-sharing program, and opted for purchasing and re-outing used planes instead of buying new planes. Taken together, Delta’s cost management and benefits leadership strategies have allowed Delta to earn industry-leading profit margins.

    References

    1.2019 Annual Report. Atlanta, Georgia. Delta Airlines Inc & Annual Report. Washington, DC. United Airlines Inc.

    2.Anderson, Richard H. “Delta's CEO on Using Innovative Thinking to Revive a Bankrupt Airline.” HBS - Competitive Strategy. Harvard Business Review, March 19, 2015.

    3.Agarwal, Prateek. “Oligopoly Market Structure.” Intelligent Economist, May 21, 2020.

    4.C, Sam. “Delta Airlines: Flying High in a Competitive Industry.” Technology and Operations Management. Harvard Business Review. Accessed April 5, 2021.

    5.DePersio, Greg. “Analyzing Porter's Five Forces Model on Delta Airlines.” Investopedia. Investopedia, August 29, 2020.

    6.Hayward, Justin. “How Airline Ticket Pricing Works.” Simple Flying, October 22, 2020.

    7.“How Delta Uses Cost Advantages to Soar Above Competition.” Smart Advantage, January 28, 2021.

    作者簡(jiǎn)介

    黎子墨(1998.04—),男,漢族,湖北省武漢市人,佐治亞理工學(xué)院經(jīng)濟(jì)學(xué)碩士。研究方向:計(jì)量經(jīng)濟(jì)和數(shù)量經(jīng)濟(jì)。

    About the author:

    Zimo Li, male, born in April 1998 in Wuhan, Hubei Province, China, Han nationality. Master of economics, Georgia Institute of technology.

    Research interests: Econometrics and quantitative economy.

    猜你喜歡
    佐治亞理工學(xué)院簡(jiǎn)介
    江蘇理工學(xué)院
    常熟理工學(xué)院
    理工學(xué)院簡(jiǎn)介
    Research on Guidance Mechanism of Public Opinion in Colleges and Universities in Micro Era
    Book review on “Educating Elites”
    Hometown
    任意門(mén)
    美國(guó)佐治亞電力公司獲準(zhǔn)開(kāi)展初步廠址工作
    亚洲成av片中文字幕在线观看| 亚洲第一电影网av| 黄频高清免费视频| 国产99白浆流出| 成人欧美大片| 亚洲人成电影免费在线| 亚洲av日韩精品久久久久久密| 国产av在哪里看| 国产熟女xx| 老司机午夜十八禁免费视频| 一个人免费在线观看的高清视频| 国产成年人精品一区二区| 亚洲片人在线观看| 国产精品国产高清国产av| 少妇的丰满在线观看| 国产成人精品无人区| 成人三级黄色视频| 久热爱精品视频在线9| 99久久综合精品五月天人人| 国产精品自产拍在线观看55亚洲| 老汉色∧v一级毛片| 日日爽夜夜爽网站| 非洲黑人性xxxx精品又粗又长| 在线天堂中文资源库| 欧美又色又爽又黄视频| 国产精品乱码一区二三区的特点| 亚洲一区高清亚洲精品| 狠狠狠狠99中文字幕| 国产精品香港三级国产av潘金莲| 午夜两性在线视频| 精品久久久久久久久久免费视频| 亚洲人成网站高清观看| 欧美色视频一区免费| 国产一区二区三区在线臀色熟女| 午夜福利欧美成人| 中文亚洲av片在线观看爽| 色综合婷婷激情| 一卡2卡三卡四卡精品乱码亚洲| 中文字幕另类日韩欧美亚洲嫩草| 欧美又色又爽又黄视频| 日韩精品中文字幕看吧| 伦理电影免费视频| 高清毛片免费观看视频网站| 亚洲熟妇中文字幕五十中出| 日本熟妇午夜| 国产精品亚洲一级av第二区| 嫁个100分男人电影在线观看| 国产国语露脸激情在线看| 久久久久亚洲av毛片大全| 欧美色欧美亚洲另类二区| 精品国产美女av久久久久小说| 999精品在线视频| 久久 成人 亚洲| 99热6这里只有精品| 色综合站精品国产| 成年版毛片免费区| 欧美日韩一级在线毛片| 久久精品国产亚洲av香蕉五月| 亚洲三区欧美一区| 国产精品野战在线观看| 亚洲av电影不卡..在线观看| 久久性视频一级片| 嫩草影院精品99| 婷婷六月久久综合丁香| 麻豆成人av在线观看| 亚洲人成网站高清观看| 亚洲成国产人片在线观看| а√天堂www在线а√下载| 久久精品国产清高在天天线| 老司机靠b影院| 美女国产高潮福利片在线看| xxx96com| 最近在线观看免费完整版| 琪琪午夜伦伦电影理论片6080| 中文字幕人成人乱码亚洲影| 亚洲中文字幕一区二区三区有码在线看 | 日韩 欧美 亚洲 中文字幕| 亚洲人成网站在线播放欧美日韩| 观看免费一级毛片| 非洲黑人性xxxx精品又粗又长| 成在线人永久免费视频| 国产精品香港三级国产av潘金莲| 亚洲熟女毛片儿| 久久精品国产综合久久久| 成人亚洲精品av一区二区| 一边摸一边抽搐一进一小说| a级毛片a级免费在线| 国产蜜桃级精品一区二区三区| 日韩中文字幕欧美一区二区| 国产亚洲精品一区二区www| 欧美成人免费av一区二区三区| 真人一进一出gif抽搐免费| 亚洲国产精品成人综合色| 听说在线观看完整版免费高清| 国产精品香港三级国产av潘金莲| 午夜视频精品福利| 少妇 在线观看| 国产精品亚洲美女久久久| 国产人伦9x9x在线观看| 国产亚洲欧美98| 这个男人来自地球电影免费观看| 久久久水蜜桃国产精品网| 91成人精品电影| 熟女电影av网| 亚洲专区字幕在线| 亚洲精品av麻豆狂野| 国产成人啪精品午夜网站| 亚洲成人久久爱视频| 久久亚洲真实| 久久久久久久午夜电影| 草草在线视频免费看| 国产成人欧美| 国产黄片美女视频| 精品高清国产在线一区| 欧洲精品卡2卡3卡4卡5卡区| 免费在线观看黄色视频的| 亚洲欧美一区二区三区黑人| 久久久久九九精品影院| 美女大奶头视频| 国产一级毛片七仙女欲春2 | 老汉色av国产亚洲站长工具| 国产一区在线观看成人免费| 午夜免费成人在线视频| 亚洲 欧美 日韩 在线 免费| 亚洲专区国产一区二区| 老熟妇乱子伦视频在线观看| 欧美 亚洲 国产 日韩一| ponron亚洲| 亚洲午夜精品一区,二区,三区| 亚洲欧美日韩高清在线视频| 色尼玛亚洲综合影院| 国产单亲对白刺激| aaaaa片日本免费| 欧美乱妇无乱码| 久久久久久久精品吃奶| 成在线人永久免费视频| 女生性感内裤真人,穿戴方法视频| 国产av一区二区精品久久| 在线视频色国产色| 欧美+亚洲+日韩+国产| 麻豆久久精品国产亚洲av| 日韩精品中文字幕看吧| 欧美日本视频| 免费一级毛片在线播放高清视频| 男女那种视频在线观看| 欧美国产日韩亚洲一区| 少妇的丰满在线观看| 国产亚洲欧美精品永久| 日本一区二区免费在线视频| 一个人观看的视频www高清免费观看 | 国产激情偷乱视频一区二区| 欧美中文综合在线视频| av片东京热男人的天堂| 久9热在线精品视频| a级毛片在线看网站| 亚洲av第一区精品v没综合| 亚洲性夜色夜夜综合| 日韩三级视频一区二区三区| 日韩欧美一区二区三区在线观看| 精品人妻1区二区| 黄网站色视频无遮挡免费观看| 又黄又爽又免费观看的视频| 中文资源天堂在线| 免费一级毛片在线播放高清视频| 精品第一国产精品| 欧美日韩亚洲国产一区二区在线观看| 国内精品久久久久久久电影| 久久午夜亚洲精品久久| 亚洲七黄色美女视频| 亚洲一码二码三码区别大吗| 亚洲av熟女| 亚洲aⅴ乱码一区二区在线播放 | 美女午夜性视频免费| 午夜影院日韩av| 丁香欧美五月| 久久人人精品亚洲av| 亚洲美女黄片视频| 亚洲精品在线观看二区| 91字幕亚洲| 欧美+亚洲+日韩+国产| 欧美一区二区精品小视频在线| 国产精品综合久久久久久久免费| 国产99白浆流出| 老汉色∧v一级毛片| 老司机靠b影院| 精品电影一区二区在线| 免费在线观看影片大全网站| 国产成人欧美| 每晚都被弄得嗷嗷叫到高潮| 国产高清视频在线播放一区| 亚洲专区中文字幕在线| 日本五十路高清| av中文乱码字幕在线| 2021天堂中文幕一二区在线观 | 在线观看午夜福利视频| 欧美成人性av电影在线观看| 午夜亚洲福利在线播放| 老汉色av国产亚洲站长工具| АⅤ资源中文在线天堂| 国产av一区二区精品久久| 两个人免费观看高清视频| 国产精品香港三级国产av潘金莲| 日韩精品免费视频一区二区三区| 日韩精品免费视频一区二区三区| 午夜a级毛片| 一a级毛片在线观看| 久久狼人影院| 香蕉av资源在线| 黄片小视频在线播放| 欧美国产精品va在线观看不卡| 中文资源天堂在线| 老司机深夜福利视频在线观看| 成人国产综合亚洲| 欧美日韩精品网址| 欧美精品亚洲一区二区| 亚洲 欧美 日韩 在线 免费| 丝袜在线中文字幕| 日韩精品青青久久久久久| 人人妻,人人澡人人爽秒播| 国产一卡二卡三卡精品| 亚洲熟妇中文字幕五十中出| 色综合亚洲欧美另类图片| 亚洲av成人av| 久久久水蜜桃国产精品网| 欧美性猛交黑人性爽| 欧美激情高清一区二区三区| 一个人观看的视频www高清免费观看 | 亚洲国产精品sss在线观看| 国产真人三级小视频在线观看| 久久天堂一区二区三区四区| 亚洲精品国产精品久久久不卡| 制服丝袜大香蕉在线| 精品久久久久久久末码| 午夜精品在线福利| 久久久久久亚洲精品国产蜜桃av| 久久伊人香网站| 亚洲国产精品久久男人天堂| x7x7x7水蜜桃| 在线观看日韩欧美| 午夜精品在线福利| av片东京热男人的天堂| 国产精品永久免费网站| 精品国内亚洲2022精品成人| 熟妇人妻久久中文字幕3abv| 黑人巨大精品欧美一区二区mp4| 亚洲成人久久性| 国产野战对白在线观看| 午夜福利一区二区在线看| 成人免费观看视频高清| 一级片免费观看大全| 久久久国产成人免费| 精品欧美一区二区三区在线| 亚洲在线自拍视频| 国产99久久九九免费精品| 99久久国产精品久久久| 亚洲精品在线美女| 欧美黑人巨大hd| 91九色精品人成在线观看| 18禁黄网站禁片午夜丰满| 日本一区二区免费在线视频| 国产亚洲欧美98| 91老司机精品| 欧美 亚洲 国产 日韩一| 亚洲三区欧美一区| 久久国产乱子伦精品免费另类| 欧美激情 高清一区二区三区| 极品教师在线免费播放| 丝袜人妻中文字幕| 国产日本99.免费观看| 级片在线观看| 91九色精品人成在线观看| 亚洲三区欧美一区| 国产男靠女视频免费网站| 18禁国产床啪视频网站| 国产精品自产拍在线观看55亚洲| 欧美黑人巨大hd| 国产成人一区二区三区免费视频网站| 亚洲精品国产一区二区精华液| 免费观看精品视频网站| 亚洲一区二区三区不卡视频| 欧美成人午夜精品| 欧美又色又爽又黄视频| 色综合亚洲欧美另类图片| 亚洲国产欧美日韩在线播放| 韩国av一区二区三区四区| 搞女人的毛片| ponron亚洲| 久久精品国产清高在天天线| 久久中文字幕人妻熟女| 三级毛片av免费| 亚洲国产精品久久男人天堂| 久久 成人 亚洲| 老熟妇乱子伦视频在线观看| 亚洲 国产 在线| 国产高清激情床上av| 成人免费观看视频高清| 麻豆av在线久日| 99久久精品国产亚洲精品| 亚洲avbb在线观看| 国产单亲对白刺激| 国产精品一区二区精品视频观看| 国产真人三级小视频在线观看| 手机成人av网站| 在线国产一区二区在线| 一区二区三区精品91| 国产伦人伦偷精品视频| av有码第一页| 欧美日韩亚洲综合一区二区三区_| 99久久无色码亚洲精品果冻| 这个男人来自地球电影免费观看| 操出白浆在线播放| 国产精品亚洲av一区麻豆| 高清在线国产一区| 色综合婷婷激情| 欧美日韩精品网址| 精品电影一区二区在线| 午夜免费成人在线视频| 精品国产一区二区三区四区第35| 88av欧美| 日日干狠狠操夜夜爽| 午夜免费激情av| 精品一区二区三区四区五区乱码| 国产久久久一区二区三区| 亚洲人成网站高清观看| 欧美乱码精品一区二区三区| 亚洲三区欧美一区| 搡老岳熟女国产| 亚洲精品美女久久av网站| 少妇裸体淫交视频免费看高清 | 日韩精品青青久久久久久| 在线天堂中文资源库| x7x7x7水蜜桃| 女人爽到高潮嗷嗷叫在线视频| 亚洲欧美日韩无卡精品| 丝袜美腿诱惑在线| 老司机午夜福利在线观看视频| 国产免费男女视频| 人人妻,人人澡人人爽秒播| 女性生殖器流出的白浆| 免费看日本二区| 国产精品乱码一区二三区的特点| 国产视频一区二区在线看| 人人妻人人澡欧美一区二区| 亚洲激情在线av| 国产伦人伦偷精品视频| 亚洲色图 男人天堂 中文字幕| 狂野欧美激情性xxxx| 国内精品久久久久精免费| 亚洲午夜精品一区,二区,三区| 一区二区三区高清视频在线| 亚洲全国av大片| 国产主播在线观看一区二区| 成人亚洲精品一区在线观看| 中亚洲国语对白在线视频| 国产极品粉嫩免费观看在线| 91大片在线观看| 中文字幕精品免费在线观看视频| 亚洲 欧美 日韩 在线 免费| 午夜福利18| 天堂√8在线中文| 色播亚洲综合网| 精品一区二区三区四区五区乱码| 男女那种视频在线观看| 女人爽到高潮嗷嗷叫在线视频| 一进一出抽搐gif免费好疼| 一区二区日韩欧美中文字幕| 国产精品日韩av在线免费观看| 亚洲国产精品成人综合色| 午夜老司机福利片| 怎么达到女性高潮| 丝袜在线中文字幕| 日韩欧美一区视频在线观看| 日韩欧美免费精品| 黄色片一级片一级黄色片| 日本一本二区三区精品| 国产免费男女视频| 欧美日本亚洲视频在线播放| 久久久久久大精品| 男人操女人黄网站| 国产精品永久免费网站| 欧美精品啪啪一区二区三区| 村上凉子中文字幕在线| 色综合站精品国产| 久久午夜亚洲精品久久| 国产在线精品亚洲第一网站| 又黄又粗又硬又大视频| 成人亚洲精品一区在线观看| 俺也久久电影网| 99热这里只有精品一区 | 国内精品久久久久精免费| 女同久久另类99精品国产91| 国产又爽黄色视频| 黑丝袜美女国产一区| 人人妻人人澡人人看| 久久久久久久久免费视频了| 动漫黄色视频在线观看| 久久久水蜜桃国产精品网| 十分钟在线观看高清视频www| 曰老女人黄片| 天天躁狠狠躁夜夜躁狠狠躁| 国产精品精品国产色婷婷| 嫁个100分男人电影在线观看| 国产又黄又爽又无遮挡在线| 亚洲熟女毛片儿| 99热只有精品国产| 一夜夜www| 国产成人啪精品午夜网站| 欧美性长视频在线观看| 午夜影院日韩av| 国产一区二区三区在线臀色熟女| 三级毛片av免费| 精品国内亚洲2022精品成人| 亚洲中文字幕日韩| 国产欧美日韩一区二区三| 99国产精品一区二区蜜桃av| 国产亚洲欧美精品永久| 好看av亚洲va欧美ⅴa在| 免费在线观看影片大全网站| 亚洲,欧美精品.| 午夜福利视频1000在线观看| 黄色a级毛片大全视频| 国产一级毛片七仙女欲春2 | 国内精品久久久久久久电影| 国产99久久九九免费精品| 中文亚洲av片在线观看爽| 国产精品,欧美在线| 欧美黑人巨大hd| 久久久久国产一级毛片高清牌| 在线十欧美十亚洲十日本专区| 午夜影院日韩av| 久久久精品欧美日韩精品| 热99re8久久精品国产| 国产亚洲精品综合一区在线观看 | 成人永久免费在线观看视频| 久久欧美精品欧美久久欧美| 视频区欧美日本亚洲| 成年人黄色毛片网站| 啦啦啦观看免费观看视频高清| 色播亚洲综合网| 久99久视频精品免费| 亚洲国产日韩欧美精品在线观看 | 亚洲真实伦在线观看| 中文字幕另类日韩欧美亚洲嫩草| 国产v大片淫在线免费观看| 欧美精品亚洲一区二区| 在线免费观看的www视频| 亚洲成人久久爱视频| 好看av亚洲va欧美ⅴa在| av欧美777| 国产熟女午夜一区二区三区| 韩国av一区二区三区四区| 国产不卡一卡二| 男人的好看免费观看在线视频 | 日本一本二区三区精品| 成人av一区二区三区在线看| 制服丝袜大香蕉在线| 精品久久久久久久久久久久久 | 国产免费av片在线观看野外av| 亚洲色图 男人天堂 中文字幕| 男男h啪啪无遮挡| 美女午夜性视频免费| 又大又爽又粗| 国产精品野战在线观看| 巨乳人妻的诱惑在线观看| www.www免费av| 久久久久久久久中文| 色综合亚洲欧美另类图片| 一本一本综合久久| 色播在线永久视频| 久久狼人影院| 又大又爽又粗| 亚洲精品av麻豆狂野| 天天躁狠狠躁夜夜躁狠狠躁| 母亲3免费完整高清在线观看| 我的亚洲天堂| 天天躁夜夜躁狠狠躁躁| 亚洲精品中文字幕一二三四区| 法律面前人人平等表现在哪些方面| 婷婷精品国产亚洲av| 18禁国产床啪视频网站| 欧美色视频一区免费| 亚洲午夜理论影院| 精华霜和精华液先用哪个| 国产精品 国内视频| 看免费av毛片| 搡老岳熟女国产| 欧美成狂野欧美在线观看| 中文字幕高清在线视频| 97人妻精品一区二区三区麻豆 | 在线看三级毛片| 国产精品一区二区精品视频观看| 长腿黑丝高跟| 99久久精品国产亚洲精品| 欧美日韩精品网址| 中出人妻视频一区二区| 亚洲欧美精品综合一区二区三区| 88av欧美| 国产成人欧美在线观看| 一级黄色大片毛片| videosex国产| 国内久久婷婷六月综合欲色啪| 男人舔女人的私密视频| 亚洲黑人精品在线| 免费观看精品视频网站| 国产成人系列免费观看| 青草久久国产| 黄色毛片三级朝国网站| 亚洲成人精品中文字幕电影| 俺也久久电影网| 女人爽到高潮嗷嗷叫在线视频| 国产精品久久久久久精品电影 | 国产精品免费视频内射| 国产精品一区二区三区四区久久 | 成人18禁高潮啪啪吃奶动态图| 精品人妻1区二区| 亚洲精品久久国产高清桃花| 亚洲av片天天在线观看| 两个人免费观看高清视频| 99热6这里只有精品| 国产精品99久久99久久久不卡| videosex国产| 丰满人妻熟妇乱又伦精品不卡| 伊人久久大香线蕉亚洲五| 久久天躁狠狠躁夜夜2o2o| 亚洲av成人一区二区三| 国产91精品成人一区二区三区| 亚洲成a人片在线一区二区| 女同久久另类99精品国产91| 香蕉丝袜av| 免费在线观看日本一区| 久久亚洲精品不卡| 桃色一区二区三区在线观看| 国产午夜福利久久久久久| 亚洲一码二码三码区别大吗| 久久 成人 亚洲| 欧美午夜高清在线| 久久久国产成人精品二区| 久久久久久人人人人人| 男女视频在线观看网站免费 | 午夜久久久久精精品| 欧美av亚洲av综合av国产av| 99riav亚洲国产免费| 亚洲va日本ⅴa欧美va伊人久久| 日本精品一区二区三区蜜桃| √禁漫天堂资源中文www| 国产av在哪里看| 国产真实乱freesex| 日本成人三级电影网站| 亚洲七黄色美女视频| 成人精品一区二区免费| 99精品欧美一区二区三区四区| 美女扒开内裤让男人捅视频| 97人妻精品一区二区三区麻豆 | 欧美另类亚洲清纯唯美| 午夜福利在线在线| 禁无遮挡网站| 久久国产精品影院| 国产成人精品久久二区二区91| 亚洲国产日韩欧美精品在线观看 | 欧美成人性av电影在线观看| 亚洲va日本ⅴa欧美va伊人久久| 中文字幕另类日韩欧美亚洲嫩草| 在线国产一区二区在线| 国产三级黄色录像| 人人澡人人妻人| 亚洲,欧美精品.| 欧美久久黑人一区二区| 欧美激情 高清一区二区三区| 色尼玛亚洲综合影院| 国产蜜桃级精品一区二区三区| 国产av一区在线观看免费| 欧美av亚洲av综合av国产av| 久99久视频精品免费| 亚洲av成人一区二区三| 久久香蕉国产精品| 午夜免费鲁丝| 啦啦啦免费观看视频1| 欧美丝袜亚洲另类 | 午夜老司机福利片| 大型黄色视频在线免费观看| 国产真实乱freesex| 欧美日韩黄片免| 大香蕉久久成人网| 国产亚洲精品久久久久久毛片| 一级片免费观看大全| 午夜激情av网站| 日本a在线网址| 无限看片的www在线观看| 视频区欧美日本亚洲| 久久 成人 亚洲| 国产欧美日韩精品亚洲av| 中文在线观看免费www的网站 | 久久国产乱子伦精品免费另类| 在线看三级毛片| 亚洲精品一区av在线观看| 很黄的视频免费| 999久久久国产精品视频| 国产av又大| 丝袜在线中文字幕| tocl精华| 丝袜在线中文字幕| 男人操女人黄网站| 免费在线观看影片大全网站| 国产av又大| 12—13女人毛片做爰片一| 后天国语完整版免费观看| 亚洲国产高清在线一区二区三 | 国内精品久久久久久久电影| 嫩草影视91久久| 欧美日韩一级在线毛片| 欧美亚洲日本最大视频资源| 桃红色精品国产亚洲av| 久久国产精品影院| 久久亚洲真实| 757午夜福利合集在线观看|