The only major transferable currency with an American Airlines AAdvantage option, plus 14 other airline partners including JetBlue, Turkish Airlines, and Virgin Atlantic.
American Airlines AAdvantage (1:1 on Strata Premier/Elite, 1:0.7 on no-fee cards)
JetBlue TrueBlue (1:1 or 1:0.7)
Turkish Airlines Miles&Smiles (1:1 or 1:0.7)
Virgin Atlantic Flying Club (1:1 or 1:0.7)
Choice Privileges (1:1.5 or 1:1.05)
Wyndham Rewards (1:1 or 1:0.7)