For travelers who are married to an airline's frequent-flier program but have a wandering eye for other airlines' great perks and deals, there is a way out. You can instantly divorce and remarry and take your silver, gold or platinum with you.

Across the airline industry, "status matches" have become a standard way to switch carriers, or just add another one to your list of regulars, and be an instant big shot. Send one airline a recent statement showing your top status on a competitor and the carrier will match...