Several established frequent-flier plans are making changes, and one program has recently made its debut.

Breakfast is included, as is double mileage on 22 major airlines' frequent-flier plans.

There are at least three different ways that upgrades are made available to members of frequent-flier plans.

Mileage award upgrades have been around since the first frequent-flier plans began more than eight years ago and are generally the easiest to earn.

A number of changes have occurred since the first frequent-flier plans were conceived more than seven years ago.

Recently, airlines have recognized the financial liability that frequent-flier plans place on them.

The number and variety of frequent-flier plans created by airlines since the concept was introduced about seven years ago are confusing enough for most passengers.

The airlines also create advantages for passengers in frequent-flier plans.

It may be hard to believe for those who think frequent-flier plans are already too complex, but these are the good old days.

New partnership agreements among frequent-flier plans have recently taken effect.