Originally Posted by FA2pilot

Yes, Southwest has extensive agreements with most of the large carriers around the world. Notable ones that SWA is lacking are Singapore Airlines and Korean Airlines. Here's a short list of agreements that SWA has (not all-inclusive): Aer Lingus, Aerolineas Argentinas, AeroMexico, Air Canada, Air France, Air India, Air New Zealand, Air Tahiti Nui, Air Transat, Alaska Airlines, Allegiant, American Airlines, Asiana, Austrian Airlines, Avelo, Azul, Bahamas Air, Breeze, British Airways, Brussels Airlines, Cathay Pacific, China Airlines, Condor, COPA, Croatia Airlines, Delta, El Al, Emirates, Ethiopian, Etihad, EVA Air, FedEx, Fiji Airways, Finnair, FlyDubai, Frontier, GOL, Hawaiian, Iberia, Icelandair, IndiGo, ITA Airways, JetBlue, JetStar, JSX, KLM, LATAM, LOT, Lufthansa, Norse Atlantic, Porter, Qantas, Qatar, Royal Jordanian, SAS, South African Airways, Spirit, Sun Country, Swiss, TAP Air Portugal, Turkish, United, Vietnam Airlines, Virgin Atlantic, Virgin Australia, Vistara, and WestJet. Most of these agreements cover parents as well.