ya but thats not straight cash for a non serial flyer
any non mileage ideas?
You don't have to be a serial flyer to enjoy a free flight.
I personally value AA at about 1.8 cents per mile. You get 1.2 miles per dollar per year, so that an interest rate of 2.16. But it's tax free, so assuming a combined federal+state+local tax rate of 35% you would need 3.4% interest before a cash account would be more than earning miles.
If you can find anywhere in that ballpark on a liquid account I'd be shocked.