Nonsked ticket (also say " OPEN " ticket) it is to point to in grade of airliner, seat, seize the opportunity date and the airline ticket that takeoff time did not book. There is such case in the meeting on the couplet Cheng ticket of international airliner commonly.

As contrary as its, fixed ticket (also say " OK " ticket) it is to show airline ticket is in grade of airliner, seat, seize the opportunity date and the airline ticket that takeoff time already all booked. Starting station opens the passenger ticket that give is " OK " ticket.