The U.S. aircraft register, updated daily
Who holds what · as the FAA records the name

Pacific Southwest Airlines

Holds 3 approved modifications. FAA spelling: Pacific Southwest Airlines.

Approved modifications 3 · newest first

1960-01-01SA686WE · Aural warning signal when Vmo/Mmo is exceeded. · 188A, 188C
1960-01-01SA1178WE · Cockpit voice recorder. · 188C, 188A
1960-01-01SA685WE · Aural warning signal when Vmo/Mmo is exceeded. · 188C, 188A

Source: FAA Dynamic Regulatory System (type certificate data sheets, supplemental type certificates, technical standard order authorisations). An organisation's name is as the FAA spelled it on each record; related spellings are separate pages.