You further argue that frequent-flier programs add to the cost of travel for everyone.

As for its frequent-flier program, United has not made any changes yet.

He has four million miles on his frequent-flier programs.

The carriers' frequent-flier programs are expected to be linked by June 1.

"Continental would probably not be in existence but for the frequent-flier program."

Anyone can join a frequent-flier program and there is no cost for doing so.

When a carrier changes hands, frequent-flier programs have generally been continued.

This was during the early years of the frequent-flier programs.

About 57 million Americans, and 98 percent of all business travelers, belong to at least one frequent-flier program.

Along with those changes, airlines are beginning to take aim at their frequent-flier programs as well.