We use Frequent Flier tickets most of the time. For one reason, the cost of flights from here is always well over $300pp at least. Also, DH travels so much for business, he usually has lots of miles, mostly on Continental. The problem is that Continental's miles are VERY hard to come by to use. I haven't yet figured out their system of releasing miles for FF use. Often we've gotten tickets within several weeks, but had a hard time getting seats months in advance. Southwest's system sounds good-unfortunately, DH travels internationally and rarely gets on Southwest.