1. Air Canada and West Jet are instructing passengers to arrive up to three hours before their scheduled flights, because the extra security will likely cause delays.
Peter McCabe / THE CANADIAN PRESS
2. Transport Canada has limited passengers to one piece of carry-on luggage instead of the usual two on flights into the U.S. Air Canada suggests passengers avoid bringing any carry-on, and they will waive the fee for extra checked bags.
AP Photo/Gero Breloer
3. The rule on liquids is still being enforced: passengers are allowed to bring only one clear plastic zipper bag of liquids, and no one container can exceed 100 milliliters.
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4. U.S.-bound passengers will undergo a second security screening at the boarding lounge, where carry-on baggage will be checked and individuals will be patted down.
AP Photo/Paul Beaty
5. The U.S. Transportation Security Administration has imposed rules to limit on-board activities by passengers and crew in U.S. airspace. During the final hour of the flight, travellers must remain in their seats and aren't allowed to have any items on their laps.
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Detroit Metropolitan Airport, where the Delta plane on which the incident occurred, landed, was one of the first to beef up security. Travelers are seen waiting in a long line at the airport on Sunday, Dec. 27, 2009.
AP Photo/Charles Rex Arbogast
Some airport, like Los Angeles International Airport have reinforced some old security measures like random checks of vehicles. Airport police are seen operating a checkpoint on Saturday, Dec. 26, 2009.
AP Photo/Jason Redmond
Schiphol Airport in Amsterdam, where the suspect boarded the plane, stepped up security following the incident. A helicopter is seen circling the airport's traffic tower on Saturday, Dec. 26, 2009.
AP Photo/Evert Elzinga