New restrictions on U.S.-bound flights caused “very significant” delays and headaches for travellers at Canada’s busiest airport yesterday.

New regulations imposed after an apparent terror attack was thwarted Christmas Day led to “a tough day” at Pearson International Airport, a spokeswoman said.

Trish Krale, with the Greater Toronto Airports Authority, said there were “very significant delays,” mostly felt by people flying to the U.S.

Umar Farouk Abdulmutalla, a 23-year-old Nigerian man, who claimed ties to al-Qaida, was charged Saturday with trying to destroy a Detroit-bound airliner.

Many U.S.-bound flights were delayed by at least one or two hours and in some cases up to four or five hours.

Among the stricter regulations are: Passengers can’t have anything on their lap; no moving around the flight cabin in the final hour before landing; and only one carry-on bag is allowed.

More than 120 flights were listed as cancelled as of early last night, which accounts for almost 12 per cent of the total daily flights at Pearson.

Officials were asking travellers to leave plenty of extra time, to check their flight status before leaving home and to be patient.

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