GETTY The Air Force Boeing 747 has been used to carry the US President for the last 70 years

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The Air Force One Boeing 747-200, which has been used to carry the President of the United States is reaching its life expectancy next year, but the White House is yet to find replacements.

We grit our teeth and bear it in the US Air Force Kevin Buckley, program executive officer of mobility programs at the US Air Force

Although the jets can and have been driven safely in their old ages before - which is usually after 30 years - the US Air Force do not want to "take chances" with the President's safety. Kevin Buckley, program executive officer of mobility programs at the US Air Force, said: “We grit our teeth and bear it in the US Air Force.”

GETTY The US Airforce do not want to risk flying the president in an aged plane

The individual aircraft, which has a range of features including an airborne command post, communications gear and defensive equipment such as anti-aircraft missiles, costs almost £300million each. But according to an Air Force officer, the US Air Force has budgeted £1.3billion from 2015 to 2019 for the new Air Force One planes.

GETTY The US presidential planes cost up to £300 million each.

Buckley added: “It's really not just about getting the president from point A to B. "The planes are modified to be able to function even in a nuclear war."