Southwest, Yes. And currently, as long as there is even one available seat under their booking allocation, it's yours on an award ticket for the asking, even if it is the last seat on the plane! This policy holds true on each and every flight. Too bad the other carriers don't have a similar policy!!!

Hopefully when and if Southwest enforces capacity controls, they will extend the current one year expiration of their Rapid Rewards Award Tickets.

The Fine Print has always given them the option to impliment capacity controls, but in the true Southwest spirit, "A Symbol of Freedom," they have chosen not to.