If you're not thinking of booking a flight in the coming days, the airline still wants you to get in on the action. Unfortunately, though, you'll have to remember how the US Postal Service works. To enter without booking a flight, just mail a letter with your complete printed name; your address, including zip code; your daytime and evening telephone numbers, including area code(s); and a valid email address. Then voila, you're in the running, just like the suckers who already shelled out for a flight.
If you win the contest, you'll be able to recoup your free flights any time between February 1, 2018, and January 31, 2019. There's some fine print attached to the serendipitous deal, however, as the airline writes: "However, booking multiple flights departing from the same city on the same day is prohibited. Change/cancellation fees apply."