Do you have a lot of places to go in the next six weeks? If you go there on Southwest Airlines you can earn a free flight.
Southwest is offering double credit for flights before May 26, which means you can get a free flight after four round-trip flights if you complete them all by that time. Business select fares earn credit at a slightly faster rate.
If you have any Southwest flights coming up before May 26, be sure to sign up for this offer. You do need to register here.