You can try to standby earlier, sometimes the gate agent might not notice that the ticket says Priceline on it and let you through.
Also it does not hurt to call the reservation desk and ask but it might not help either. Once in awhile this bulletin board has a thread about someone who was told by the reservation desk that something was OK but the gate agent wouldn't let him through.
More travel tips:
http://members.aol.com/ajaynejr/travel.htm
[This message has been edited by AllanJ (edited 08-13-2000).]