Amex USA airline transfer partners 1:1. Didn't realize it was so extensive.

Drooling here:

Delta Skymiles, AeroMexico, Air Canada Aeroplan, Flying Blue (KLM & Air France), Alitalia MilleMiglia, Cathay’s Asia Miles, British Airways Executive Club, El Al Israel, Emirates Skywards, Frontier, Hawaiian Airlines, Iberia Plus, Jet Blue, Singapore Airlines KrisFlyer, Virgin Elevate, Virgin Atlantic, All Nippon Airways (ANA) Mileage Club