It is my experience that no two people pay the same price when they book an airline ticket. The list price for an airline seat varies depending on the number of seats already sold and the closeness of the purchase date to the departure date. If an airline fears that a flight will have too many empty seats, they reduce the price to sell more tickets. If they are experiencing robust sales they will increase the price to ensure they earn the maximum revenue.
How can you use the concept of pricing by the units you have available to maximize revenues?