Vintage American Eagle  Inflight Airline Airplane Magazine May June 2006

American Eagle" can refer to two distinct entities: American Eagle Outfitters, a clothing retailer, and American Eagle, a brand name used by American Airlines for its regional airlines. 2

. American Eagle (American Airlines)

This refers to a brand name used by American Airlines for its network of regional airlines, which operate flights under code-sharing agreements with American. 
These regional airlines serve smaller markets and connect passengers to American's hubs. 
Examples of airlines operating under the American Eagle brand include Envoy Air, PSA Airlines, and Piedmont Airlines. 
American Eagle flights are an integral part of American Airlines' operations, with many passengers connecting to or from mainline flights.