Originally Posted by articos

What you can do is book the fully refundable Y, then as it gets closer if you know you're going to fly it, just upgrade it to F. That way you have the flexibility until the last minute, as long as the F seats are available. Upgrade meaning either just buy-up to the F fare which would then become non-refundable if you know you're going to fly, or use the $250 24 hr upgrades.