Top administration officials engaged in an elaborate deception to spirit President Trump out of Turkey during the NATO summit there last month, transporting him in a catering container to a military jet because of a threat against him and Air Force One from Iran, two senior U.S. officials said on Monday.

Mr. Trump and other officials had said publicly that he would be leaving Turkey on July 8 aboard one of the older versions of Air Force One rather than a luxury 747-8 donated by Qatar that he had flown in on. Mr. Trump told reporters at the time that he was making the switch for “old time’s sake.”

Mr. Trump boarded the older plane from the left-side door in view of cameras, and news organizations, including The New York Times, reported that he had traveled on it to Britain, where he switched back to the newer plane. The Times reported at the time that the decision was driven in part by concern about the security of the new plane donated by Qatar, which had not been equipped with all of the defensive capabilities of older versions.

But instead of flying out aboard that older, powder blue, modified 747, Mr. Trump was whisked off that plane via a catering container that had been lifted to the opposite side of the plane from where the journalists traveling with him boarded, one of the U.S. officials said. The president was then taken to a third plane, which he flew in secret to Britain, the official with knowledge of the matter said.

Reporters on the older plane were not told that Mr. Trump had not flown with them from Turkey to an air base in Britain, making them unwitting participants in the ruse and leaving them, along with some White House staff members, to serve as unknowing decoys.

After Mr. Trump arrived in Britain, he was secretly moved back to the older version of Air Force One. He then disembarked in view of reporters and walked across the tarmac to the plane donated by Qatar, which he flew to Washington.