1:1 point transfer to leading airline and hotel loyalty programs and the Ultimate Rewards ® travel partners and the participating programs include airline travel partners such as: British Airways Executive Club, Flying Blue AIR FRANCE KLM, Korean Air SKYPASS, Singapore Airlines KrisFlyer, Southwest Airlines Rapid Rewards ®, United MileagePlus ®, Virgin Atlantic Flying Club, and more. (creditsesame.com)
However, American Express Membership Rewards Points can be transferred to a wider variety of airline travel partners. (upgradedpoints.com)
There are a few more Amex airline travel partners, but here's a current list of all the Chase air travel partners: (johnnyjet.com)