Bill payment service Plastiq lets you pay people by check and they charge your credit card. You earn miles, and if you use you a BankDirect checking account then it’s a good way to also earn American Airlines miles ‘on the float’ because the money stays in your checking account longer.
Plastiq has a promotion where instead of their normal 2.5% fee for processing payments, they’ll charge you just 1.75% for rent or mortgage payments.