Do you have any?
What type of rewards do you get besides miles?

We have a US Air and Alaska credit cards and love the companion vouchers that they give us. $119 for a companion to fly is a great deal. Especially if you travel long flights that always cost $200 or more.

We are going to Florida in August and a RT ticket for one person will cost us $550. The voucher alone saves us a lot of money. It's going to cost us $650ish for two people to fly RT ($325 each! I'll take it!!)

US Airways card only allows flights within the contagious US (no Alaska or Hawaii), but Alaska will allow us to fly to Hawaii with the companion flight! More trips to Hawaii! Woohoo!

I heard Southwest's credit card is another good one, but we have never been on a SW flight.