U.S. President Donald Trump (R, silhouetted in window) arrives via Marine One helicopter at the White House in Washington, U.S. August 14, 2017.

An aviator waits for a boarding ramp as U.S. President Donald Trump arrives in Harrisburg, Pennsylvania, U.S., October 11, 2017.

Air Force One is seen before U.S. President Donald Trump boards as he departs for West Palm Beach, Florida, from Joint Base Andrews, Maryland, U.S., November 21, 2017.

Ivanka Trump walks from Air Force One to a waiting vehicle upon arrival, as U.S. President Donald Trump boards Marine One in the background, at Joint Base Andrews in Maryland, U.S., January 18, 2018.

U.S. President Donald Trump arrives from Andrew's Air Force Base aboard Marine One on the South Lawn at the White House in Washington in Washington U.S., May 13, 2017.

U.S. President Donald Trump boards Marine One helicopter as he departures the Oval Office of the White House for Springfield, Missouri, in Washington D.C., U.S. August 30, 2017.

Air Force One departs Las Vegas past the broken windows on the Mandalay Bay hotel, where shooter Stephen Paddock conducted his mass shooting along the Las Vegas Strip in Las Vegas, Nevada, U.S., October 4, 2017.

Members of U.S. President Donald Trump's White House staff can be seen inside Air Force One as they wait to deplane after returning from a weekend at Trump's New Jersey golf estate home to Joint Base Andrews, Maryland, U.S. May 7, 2017.

U.S. President Donald Trump, his wife Melania and son Barron wave as they Board Air Force One to depart Joint Base Andrews in Maryland, U.S., on their way to Florida March 17, 2017. Reuters/Kevin Lamarque

U.S. President Donald Trump speaks to the pilot of Marine One as he arrives at the White House in Washington, U.S., April 9, 2017.

U.S. President Donald Trump is reflected in the fuselage as he boards Air Force One to depart as he returns home to the U.S. from Ninoy Aquino International Airport in Manila, Philippines November 14, 2017.

US President Donald J. Trump boards Air Force One before departing from Noi Bai international airport, in Hanoi, Vietnam 12 November 2017. REUTERS/Minh Hoang/Pool

The tail of Air Force One is seen as U.S. President Donald Trump and First Lady Melania Trump arrive at Warsaw military airport in Warsaw, Poland July 5, 2017.

Marine One passes the Statue of Liberty as U.S. President Donald Trump arrives to attend the Presidents Cup golf tournament in Jersey City, New Jersey, U.S., October 1, 2017.

U.S. President Donald Trump returns a salute as he steps from Marine One to board Air Force One in Morristown, New Jersey, U.S., on his way back to Washington August 20, 2017.

Air Force One transporting U.S. President Donald Trump lands at Luis Munoz Marin International Airport, as part of a visit to the areas affected by Hurricane Maria, in San Juan, Puerto Rico October 3, 2017.

U.S. President Donald Trump arrives aboard Air Force One at Orlando International Airport in Orlando, Florida, U.S. March 3, 2017.

U.S. President Donald Trump pauses as he talks to journalists who are members of the White house travel pool on board Air Force One during his flight to Palm Beach, Florida while over South Carolina, U.S., February 3, 2017.

A flock of birds fly past the Marine One helicopter with U.S. President Donald Trump aboard, as he returns to the White House after a visit to the Walter Reed National Military Medical Center in Washington, U.S., December 21,

A helicopter carrying U.S. President Donald Trump flies over the mountains en route to Davos, Switzerland January 25, 2018.

Late afternoon shadows are cast as U.S. President Donald Trump descends the steps of Air Force One upon his return to Joint Base Andrews in Maryland, U.S., January 18, 2018.

White House senior adviser Jared Kushner looks on from the top of the stairs as U.S. President Donald Trump arrives from a day trip to Ohio aboard Air Force One at Joint Base Andrews, Maryland, U.S. June 7, 2017.