Cons: Wanna Get Away fare fliers might find it takes longer to earn a free ticket.

Info: http://www.southwest.com

United Mileage Plus

Pros: Members can earn miles on United, Star Alliance and partner airlines and redeem miles for United, Continental and Star Alliance flights; miles can be earned and used with more than 100 leading brands/partners.

Cons: $25-$30 to book with an agent

Info: http://www.united.com

Virgin America Elevate

Pros: Points program. Awards begin at 2,500 points (which can be earned in four round trips). Elevate program is linked for reciprocal earning on V Australia, Virgin Blue and Virgin Atlantic.

Cons: $20 to book by phone

Info: http://www.virginamerica.com

Source: Airlines and airline websites

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