We're not saying United Airlines only earns miles with these frequent flyer programs, just that these are the only ones we know about.
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C class on United Airlines earns miles on…
United Airlines can earn miles on: Aegean Airlines, Aer Lingus, Air Canada, Air China, Air India, Air New Zealand, All Nippon Airways, Asiana, Avianca, Azul Airlines, COPA Airlines, EgyptAir, Ethiopian Airlines, EVA Airways, Miles & More, SAS Scandinavian Airlines, Singapore Airlines, South African Airways, TAP Portugal, Thai Airways, Turkish Airlines, United Airlines, Vistara