FREE 2,500 OnePass miles from Continental for Middle Seat Guarantee

When you purchase a full-fare Economy ticket and fly on Continental Airlines or Continental Micronesia-operated flights you'll receive a window or aisle seat in Economy Class every time or Continental will give you 2,500 OnePass miles. Read the terms and conditions to see what kind of ticket qualifies. Note the other nice goodies you get with a full fare ticket. Be sure to take advantage of them.

I love Continental because its miles never expire. Most airline miles expire only if you have not had an activity in your account within the last 1 - 3 years. However, Continental's terms and conditions say:
"If no mileage is deposited in your account for 18 consecutive months, commencing after June 1, 2001, your membership will be cancelled, and your miles may be forfeited. To keep your account active, you can earn mileage with a variety of airline, non-travel and shopping partners."

An easy way to earn Continental miles is to use a registered credit card at a Continental iDine restaurant.