US President Donald Trump used his old Air Force One plane to leave the Nato summit in Turkey after a switch was made at the request of the US Secret Service 'as a security precaution.'Trump sent his new Qatari-gifted jet ahead to Britain before his arrival. After landing at RAF Mildenhall in Suffolk aboard his old aircraft, the US President switched to the new plane for the journey back to Washington. Trump said on his Truth Social network he was sending the new jet to Mildenhall airbase so that service members would have a 'chance to tour the Aircraft.''Everybody is so excited, and we thought that they should be the first. For old time's sake, we´ll be taking the former Air Force One, from Turkey,' Trump added.But the switch from the new jet on its maiden foreign trip sparked speculation it was because its security features were lacking, particularly as the US launched fresh strikes against Iran, which borders Turkey. According to the New York Times, citing unnamed security sources, the new plane lacks some capabilities of the old plane, but the switch was not made because of a specific threat.Reporters were told to keep window shades closed in the press cabin during take-off, without explanation.It came as Trump alluded to previous alleged assassination attempts by Iran during a press conference on Wednesday. President Donald Trump waves as he switches planes at US Air Force Base, RAF Mildenhall in Suffolk Eastern England President Donald Trump's £300m new Air Force One touched down in the UK on WednesdayThe President declared at the NATO summit in Turkey: 'They [Iran] want to take out the US leader - me. I'm on every list.''I'm on every single one of their lists, and so far I guess I've been a little bit lucky, but that maybe doesn't last very long, because that's the way it goes,' Trump continued.His warning came as hardline lawmakers in Tehran openly called for missiles to be fired at his location at the summit. Earlier this week, mourners at Ayatollah Ali Khamenei's funeral placed a death bounty on Trump.The President again brought up his demise during a press conference alongside Marco Rubio and his other top cabinet officials.While discussing Iran's leadership, installed after Khamenei was killed in the war, Trump said: 'They're gone now. They have another set of leaders. They may be gone.''Who knows? And you know what, I may be gone too because I'm their number one target. It's out all over the place. I'm the number one because they're scum.'Trump's comments came after he declared his ceasefire with Iran 'over' and unleashed fresh strikes on the regime after Iranian attacks on commercial vessels in the Strait of Hormuz. During Khamenei's funeral on Monday, footage from Tehran shows pro-regime demonstrators with posters featuring red crosshairs over Trump's face, above the seven-word warning: 'Sooner or later, your heads will roll.'Other posters showed the faces of JD Vance and Pete Hegseth over a crosshair with the phrase: 'There will be blood.'Chants of 'Death to America' and 'Death to Israel' rang out across the capital as Khamenei's coffin was borne through the streets of Tehran.Iranians were also seen lighting US and British flags on fire while hurling rocks at pictures of Trump. An effigy of Trump being hanged was pictured near the front of the funeral procession.The regime's desire to kill Trump goes back to his first term, following the 2020 drone strike the President ordered that killed Revolutionary Guard general Qasem Soleimani.US intelligence repeatedly warned during his 2024 campaign that Iran was plotting to assassinate him as well as former officials from his first term in revenge for the strike.Federal prosecutors charged a Revolutionary Guard operative with offering $300,000 to have Trump's former national security advisor John Bolton murdered on American soil.Trump's ex-Secretary of State Mike Pompeo and one-time Iran envoy Brian Hook were forced to live under round-the-clock government protection.Aboard the new Air Force One after leaving Turkey, Trump told a reporter, 'you're probably on a dangerous flight because of the sleazebags we have to deal with' - an apparent reference to Iran, which he went on to refer to as 'sick people.' The President declared at the NATO summit in Ankara, Turkey: 'They [Iran] want to take out the US leader - me. I'm on every list' Pro-regime demonstrators in Tehran hold a poster featuring crosshairs over Trump's face as they mourn Ayatollah Ali Khamenei on Sunday Aboard the new Air Force One after leaving Turkey, Trump told a reporter, 'you're probably on a dangerous flight because of the sleazebags we have to deal with'Join the discussionShould a US president ever accept a luxury aircraft from a foreign nation?What's your view?Asked if he was aware of a credible threat from Iran, Trump only said, 'I have a threat all the time. I'm number one on their list.'Qatar's royal family donated the 747-8 plane last year after Trump complained about the state of the two ageing jets that have served as the US presidential plane since 1990.The new plane was rapidly retrofitted and equipped with security features before making its first flight with Trump on July 1.It features a new red, white and navy blue colour scheme in a change from the previous white and light blue livery.Two brand-new Boeing Air Force Ones are due to be delivered later this decade after a series of delays.Critics have raised a host of ethical, constitutional and security concerns about the gifting of an aircraft worth hundreds of millions of dollars by a foreign power like Qatar.