War wohl ein Wartungsfenster.
Aber hier mal ein Auszug:
Expedia has chosen to no longer offer American Airlines fares on its website. Customers looking to compare flights or fares online should visit other travel sites such as Kayak.com or Priceline.com for the most accurate and up-to-date information, or you can always find our Lowest Fares Guaranteed and No Online Booking Fee at AA.com. American flights can also be purchased from a wide range of accredited travel agencies across the globe.
Tickets for air travel on American are no longer available for purchase on Expedia owing to a commercial dispute. Expedia’s actions to remove American may mislead some customers to believe they have fewer choices, even in situations where American’s fares are lower than other airlines, or when American offers superior schedules.
As of December 21, 2010, schedules and airfares for flights on American Airlines and American Eagle are also no longer available on Orbitz.com or websites powered by Orbitz.com.