You can often earn frequent-flier miles on your primary airline by flying with an airline partner. Here is a list of some of the major alliances. FF denotes "frequent flier."

Oneworld (www.oneworld.com) members:

Air Berlin

(866) 266-5588 reservations/FF

http://www.airberlin.com

American Airlines/American Eagle

(800) 882-8880 FF

http://www.aa.com

British Airways

(800) 452-1201 FF

http://www.britishairways.com

Cathay Pacific

(866) 892-2598 FF

http://www.cathaypacific.com

Finnair

(800) 950-3387

http://www.finnair.com

Iberia

(800) 772-4642 reservations

http://www.iberia.com