The official kickoff of summer travel season, Memorial Day, is fast approaching! Orbitz revealed the weekend`s busiest airports, based on customer bookings. Memorial Day weekend marks the beginning of the summer season with long weekend trips that make airports much busier that usual, said Heather Leisman, senior director of merchandising for Orbitz.

Travelers should prepare for longer lines and wait times. Simple steps like signing up for OrbitzTLC Alerts and using the airline kiosks to check-in can help ease the potential hassles and wait times.

Orbitz Insider Index - Memorial Day Weekend Busiest Airports

Orbitz examined the advanced ticket sales of Memorial Day weekend 2007 to determine which are the busiest airports in the world for outbound U.S. travelers. For the second year in a row, Chicago O`Hare ranked as the nation`s busiest airport, with London Heathrow taking the honors amongst international airports.

Orbitz also used booking data to determine the busiest days to travel over the holiday weekend. Friday, May 25th, will be the busiest day to travel to the airport, whereas Sunday, May 27th, travelers can find some respite from the crowds by returning home a day early.

The Orbitz Insider Index