Well, as already posted, PenFed Amex seems to do what you want:

https://www.penfed.org/PenFed-Premium-Travel-Rewards-American-Express-Card/

• Earn 5 points on airfare purchases
• Earn 1 point on all other purchases
• 20,000 bonus points when you spend $2,500 within the first 3 months of opening the Card account – that’s worth $200 toward your next round-trip airline ticket
• No annual fee
• No foreign transaction fees