Great Airlines of the Past

Pacific Southwest Airlines (PSA) (IATA: PS, ICAO: PSA, and Callsign: PSA) was an airline headquartered in San Diego, California. It is one of the four heritage airlines that form US Airways, the other airlines being America West Airlines, Piedmont Airlines and Allegheny Airlines. Allegheny Airlines begun the process of merging into Piedmont Airlines in 2004. America West and US Airways announced their merger in 2005, while the other mergers occurred in the 1980's. Prior to its merger, PSA was one of the first large discount airlines in the United States and is considered a precursor to Southwest Airlines.