Better frequent-flier programs, more convenient schedules, higher fares.

American would immediately become a stronger presence along the lucrative and crowded East Coast, allowing it to compete more effectively with Delta Air Lines and United Airlines, which is seeking government approval for its purchase of the bulk of US Airways. And with American and United planning to operate jointly one of the shuttles servicing Boston, New York and Washington, the two giant airlines would have new muscle to compete for corporate travel contracts. The deal is bound to heighten the battle for passengers in the region with Delta Air Lines, which provides the other shuttle service and is strong on many north-south routes along the East Coast.
http://www.nytimes.com/2001/01/09/business/09FLY.html


AND:

UAL's United Airlines and AMR Corp.'s American Airlines' plans to swap and even share some assets may help resolve regulators' antitrust concerns about other acquisitions the two are pursuing, but the proposed rearranging of the airline industry has done little to waylay fears about the growing impact of consolidation.

American is close to a deal to acquire faltering Trans World Airlines Inc., the nation's eighth-largest carrier, taking on assets and potential liabilities with a total value of nearly $2 billion, people involved in the transactions said. American's deal with TWA is contingent on a filing under Chapter 11 of the U.S. Bankruptcy Code by the St. Louis airline, so that leases and debt can be renegotiated.
http://public.wsj.com/sn/y/SB978995579341533810.html