Canadians can now expect longer delays at airports due to new security measures for U.S. bound flights. Both Air Canada and WestJet are advising passengers to arrive at airports at least two hours prior to scheduled departures to allow for additional screening. Air Canada says that the new measures introduced by the U.S. Dept. of Homeland Security focuses on enhanced screening of personal electronic devices like tablets and laptops.. Passenger rights advocate Dr. Gabor Lukacs and travel expert Loren Christie both weigh in.