We had an awful experience trying to do seat selections and print out boarding passes ahead of time with our airline tickets purchased through Priceline. Even the airline at the airport said that the tickets were messed up and had to re-issue them due to Priceline errors. In trying to select seats and print boarding passes, we tried different servers, different computers, called the airline to assist, called Priceline to assist. Each had no answers for us other than Priceline later said many times their tickets are unable to do anything ahead of time online. We won't use Priceline again for purchasing airline tickets.