A frequent flyer number is a unique identifier assigned to members of an airlines loyalty or rewards program. It is used to track airline customers and the number of points or miles they have accumulated. Frequent flyer programs are loyalty schemes run by airlines or airline alliances, and every time customers fly, they accumulate points to be used on future travel as well as other benefits. Travelers can get their frequent flyer number by signing up with the airline, and the process differs from one airline to the next. By booking flights and referencing the frequent flyer number, travelers can begin to accumulate frequent flyer miles. The more frequently the traveler flies, the quicker they will accumulate points which can be exchanged for upgrades and bonuses. The benefits of having a frequent flyer number with an airline can be great, including priority boarding, special check-in lanes, discounts on baggage fees, and airport lounge access.