By ANNE D'INNOCENZIO, AP Retail Writer NEW YORK (AP) — Airline travelers are not only facing sticker shock this Memorial Day weekend, the kickoff to the summer travel season. They're also dealing with a pileup of flight cancellations. More than 1,500 flights were canceled as of 9:50 p.m EDT Saturday, according to flight tracking website FlightAware. That followed more than 2,300 cancellations on Friday.