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

Southwest Airlines

Named as the FAA publishes it on its approvals.

Holds 7 approved modifications, most of them for the Boeing 737. FAA spelling: SouthWest Airlines.

Approved modifications 7 · newest first

2017-01-06ST02977NY · Installation of TSO-C127 Economy Class Seats · 737-700 Series
2017-01-06ST03588NY · Installation of TSO-C127b HIC Compliant B/E Aerospace Meridian Economy Class Passenger Seats · 737-800 Series
2013-06-05ST00304SE · Installation of a Passenger Seating arrangement · 737-300 Series, 737-500 Series, 737-700 Series
2011-06-01ST00304SE-D · Installation of a Passenger Seating arrangement in accordance with Southwest Airlines Master List 98-067, Revision... · 737-300 Series, 737-500 Series, 737-700 Series
1988-07-08SA7434SW · Installation of cabin interior arrangement which reduces the cabin passenger seating capacity from122 to 116 passengers. · 737-200 Series
1983-09-20SA5537SW · Installation of underseat baggage bars. · 737-100 Series, 737-200 Series, 737-200C Series
1983-09-20SA5536SW · Installation of underseat baggage bars. · 727 Series

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