Of passenger ticket order a circumstance:

The letter that orders a circumstance to be able to go up by airline ticket reacts directly come out. "OK " express already booked; "RQ " express to had applied for to order, but did not obtain confirm or include backup; "OPEN " express to was not ordered, must deal with before seize the opportunity order affirm formalities; "NS " express to molopolize not simply baby; "SA " express to use sky beyond seat.