What They Are
All airlines have a mileage (loyalty) programs which are designed to reward continued flying with the airline. Each mile flown on the airline accrues one mile in the program. The collected miles can later be redeemed for essentially free tickets. We're saying essentially free since taxes and fees have to be paid on these tickets and in some programs this make many redemptions practically pointless. If used correctly though, these miles can allow you and your family to travel farther and in higher comfort than you would have thought possible. Think flying in business class from the US to Asia for 200$ by flying over the Pacific Ocean oneway and over the Atlantic on the return stopping over in Europe.