Research conducted by Perplexity AI using the following sources:

• Trump left NATO summit on old Air Force One, not new jet from Qatar
• Security Precaution Led Trump to Use Old Air Force One in Leaving Turkey
• Questions arise over Qatari-donated Air Force One after Secret Service advised Trump to take old plane
• Trump explains why he switched back to old Air Force One from Qatari-gifted jet after leaving NATO summit
• Secret Service urged Trump to depart Turkey on old Air Force One as a security precaution, sources say
• Trump flies partway home from Turkey in an old Air Force One
• Trump doesn't refute Iran security concerns for new Air Force One
• Trump explains why he's flying old Air Force One back to DC