I toured an Air Force One plane used by 4 US presidents. Take a look inside the 'flying Oval Office.'

In 1959, the customized Boeing 707-153 known as SAM 970 became the new presidential aircraft, replacing the propeller-powered C-121C Super Constellation used by President Dwight Eisenhower. SAM 970 was part of the VC-137 series of planes.

SAM 970 was used by Eisenhower as well as Presidents John F. Kennedy, Lyndon Johnson, and Richard Nixon.

In 1962, a newer VC-137C plane replaced it as the primary presidential aircraft, but it still transported vice presidents and other VIPs. The SAM 970 remained part of the presidential fleet until 1996.

Admission to the museum costs $26 per adult. Tickets can be purchased on the Museum of Flight's website.

Nixon took Air Force One to visit China in 1972, becoming the first US president to visit mainland China while holding office.

The plane's maximum speed was 590 miles per hour. The top speed of the current Air Force One, the VC-25A, is 630 miles per hour.

From the plane, the president could reach the White House Situation Room and the National Military Command Center and send secret communications.

Known as the "nuclear football," every president since Eisenhower has been accompanied by the briefcase at all times.

The safe also held military communication center codes.

The two galleys on Air Force One included ovens, refrigerators, and open-burner stovetops. Drink dispensers also served coffee, water, and other beverages.

A plaque next to the phone read "Caution. This phone has no security provisions. Sensitive or classified material should not be discussed."

Presidents met with staff, received briefings, and took phone calls while traveling on Air Force One, earning it the nickname of the "flying Oval Office."

Whenever Johnson adjusted the fake temperature dial, it alerted the captain, who could then decide to change the cabin's temperature or leave it the same, a Museum of Flight guide said.

Johnson's beagles would often howl if they were left in the conference room too long, according to the Museum of Flight.

The private bathroom was much more spacious than the lavatories used by the flight crew and members of the press.

The seating booth featured seat belts in case of rough air.

The roomy sets of four seats featured tables between them.

The workstation was outfitted with a lamp and typewriter.

The staff seating area looked the most similar to regular economy cabin seats.

Like the forward galley, the aft galley was furnished with kitchen appliances and drink dispensers.

First lady Jackie Kennedy chose Air Force One's blue, white, and metallic color scheme.

President-elect Donald Trump proposed new Air Force One colors of red, white, and navy blue when he was in office in 2019, but the Air Force rejected his design since the darker colors would have cost more and caused overheating issues.