It is important to ensure that the right coupons are being collected since passengers are allowed to travel only on the specific flight indicated on the ticket coupon. Incorrect collection of the coupon might cost the airline loss of revenue since the airline may not be able to collect the revenue from the sale of tickets when it goes to the Internationl Air Transport Association clearing houes. It will also create a disservice to the passengers since they will not have valid flight coupons for their next or return flights.