Chicago ? Knowing that holiday travelers would be putting the country’s new airport baggage-screening system to its first big test, Robert Chesniak gave himself 90 minutes to check his luggage Sunday at O’Hare International Airport.

That was about 85 minutes more than he needed.

“That wasn’t bad at all,” said Chesniak, 53, after a security worker wiped his bags with a sheet of material designed to pick up traces of explosive chemicals for analysis in a detector device.

Around the country, air travelers had much the same impression on what was expected to be the heaviest travel day since Jan. 1, when a Congressional order went into effect requiring that every checked bag at more than 400 of the nation’s commercial airports be screened for explosives.

“It wasn’t nearly as bad as we were led to believe it was going to be,” said Roger Burlingame, who was traveling from Chicago to Phoenix. “A piece of cake,” said his wife, Marni.

Spot checks Sunday at several of the nation’s airports showed no major delays caused by the new security measures.

“It’s about the same as before,” said Richard Blackwell of Gainesville, Ga., who watched as screeners at Atlanta Hartsfield International Airport opened and inspected a sealed box of stereo equipment before a flight to Florida.

At the international terminal for Northwest Airlines at John F. Kennedy International Airport in New York, passengers waited up to 30 minutes longer than usual while their bags were sent through giant screening machines and workers ripped open taped boxes and rifled through their contents before closing them up again.

The Transportation Security Administration, in charge of the screening process, said it was braced for a busy day, helping things to run smoothly.

“We were prepared for it. We have been getting prepared for it for several months,” TSA director of communications Robert Johnson said. “The work all came together.”

The TSA hired 56,000 employees to man the airports, including 23,000 baggage screeners and 33,000 passenger screeners, Johnson said.

Bags back up as federal security screeners examine luggage at Hartsfield Atlanta International Airport. Congressional orders to verify that no checked bag contains explosives have been carried out by 23,000 newly hired government workers at airports using new equipment.

Most travelers simply accepted the intensified screening, developed since the terrorist attacks on Sept. 11, 2001.

Before the attacks, only 5 percent of the roughly 2 million bags checked each day were screened for bombs. The federal government put an additional 23,000 screeners into airports to enact the new order that no checked bag be allowed through without verification that it contains no explosives.

“It may add a few minutes, but I think it’s worth it,” said Trina Frandsen, who checked a cardboard box and large suitcase at Kennedy for a flight home to Salt Lake City.

“Maybe they could send me through that and I could get rid of that MRI appointment I have,” Linda Johnson joked as she watched her luggage roll slowly into the bomb-detection machine at O’Hare before her flight to Los Angeles. The machine checks the density and chemical makeup of items inside each bag and alerts to anything unusual.

Sonny Salgatar, a 23-year-old college student flying home to San Diego from O’Hare, watched as security workers sent his bags through a bomb detection machine twice — the second time because they’d put the wrong tags on them the first time.

After that second pass, a screener told Salgatar one of his bags was “hot,” meaning there was something he couldn’t identify and he wanted to open the bag for an inspection.

The “hot” item turned out to be Salgatar’s clothing iron.

“Listen, anything they want to do for security is OK with me,” Salgatar said.