Extra pat-downs before boarding. No getting up for the last hour of the flight. More bomb-sniffing dogs. Airports worldwide tightened security a day after a passenger tried to light some kind of explosive on a flight into Detroit.

The Transportation Security Administration wouldn't say exactly what it was doing differently on Saturday. It didn't need to.

Passengers getting off flights from overseas reported being told that they couldn't get out of their seat for the last hour of their flight. Air Canada also said that during the last hour passengers won't be allowed access to carry-on baggage or to have any items on their laps.

The extra vigilance came after a man flying from Nigeria to Amsterdam to the U.S. tried to ignite a device just before the plane landed in Detroit on Friday. It compounded delays in a busy holiday travel period marked by snowstorms in the Midwest and heavy rain in the East.

The TSA security directive applied to U.S.-bound flights from overseas, according to a transportation security official who spoke on condition of anonymity because the official was not authorized to speak publicly.

The official said passengers traveling internationally could see increased screening at gates and when they check bags, as well as other measures on flights such as stowing carryons and personal items before the plane lands.

Flight attendants on at least one domestic flight informed passengers of similar rules. Passengers on a flight from New York to Tampa on Saturday morning were told they must remain in their seats and couldn't have items in their laps, including laptops and pillows.

Passengers on a United Airlines flight from Amsterdam to Washington were not allowed to have anything on their laps during the descent into Dulles, or to open the overhead bins an hour before landing, said Nehmi Klaassen, 32, who made the trip on Saturday.

Klaassen, who lives in Amsterdam, said lines at the airport were "ten times" longer than usual this time.

Jennifer Allen encountered tougher security on her way from Amsterdam to Detroit on Saturday. Her Northwest Airlines flight was on the same route disrupted by the attempted attack a day earlier.

"They patted you down really well," said Allen, 41, an automotive engineer from Shelby Township, Mich. "It wasn't just a quick rub, it was a slow pat. They went through everything in your bags, went through the pockets in your pants, the pockets of your coat."

Sarabjit Dhillon, 35, of Sterling Heights, Mich., was returning to Detroit from a visit to India. Even her three young children got a pat-down.