Newsweek:

 

Emir Sabah al-Ahmad al-Jaber al-Sabah was in Washington Thursday for talks with Trump over shared security interests and the ongoing fight against the Islamic State militant group (ISIS) in the region. According to Politico, Trump marveled at the jet the Kuwaiti ruler flew in on. During a later meeting with congressional delegations from New York and New Jersey, Trump is even said to have complained that the emir’s plane was longer than his own.

It is not clear whether Trump was referring to his personal private jet or Air Force One. However, as Air Force One is similar in length to the Boeing 747-400 that carries the emir, Trump likely was referring to his Boeing 757 personal plane, which is about 75 feet shorter than the Kuwaiti ruler's.

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