This photograph of Marine One was taken by James P. Blair in May 1966 during the Lyndon B. Johnson administration. In this photograph, the presidential helicopter is seen waiting for President Johnson and members of his staff to board before departing from the South Lawn. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of Marine One was taken by James P. Blair in May 1966 during the Lyndon B. Johnson administration. In this photograph, the presidential helicopter is seen waiting for President Johnson and members of his staff to board before departing from the South Lawn. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of Marine One was taken by James P. Blair in May 1966 during the Lyndon B. Johnson administration. In this photograph, the presidential helicopter is seen waiting for President Johnson and members of his staff to board before departing from the South Lawn. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of Marine One was taken by James P. Blair in May 1966 during the Lyndon B. Johnson administration. In this photograph, the presidential helicopter is seen waiting for President Johnson and a member of his staff to board before departing from the South Lawn. Johnson can be seen in the background walking up the South Grounds drive. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of President Barack Obama leaving the White House for his departure on Marine One was taken by Matthew D'Agostino on July 1, 2015. In this photograph, the presidential helicopter is seen on the South Lawn as President Obama walks towards it. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of President Barack Obama leaving the White House for his departure on Marine One was taken by Matthew D'Agostino on July 1, 2015. In this photograph, the presidential helicopter is seen on the South Lawn as President Obama walks towards it. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of President Barack Obama leaving the White House for his departure on Marine One was taken by Matthew D'Agostino on July 1, 2015. In this photograph, the presidential helicopter is seen on the South Lawn as President Obama walks towards it. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of President Barack Obama leaving the White House for his departure on Marine One was taken by Matthew D'Agostino on July 1, 2015. In this photograph, the presidential helicopter is seen on the South Lawn as President Obama walks towards it. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of President Barack Obama leaving the White House for his departure on Marine One was taken by Matthew D'Agostino on July 1, 2015. In this photograph, the presidential helicopter is seen on the South Lawn as President Obama walks towards it. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of President Barack Obama leaving the White House for his departure on Marine One was taken by Matthew D'Agostino on July 1, 2015. In this photograph, the presidential helicopter is seen on the South Lawn as President Obama walks towards it. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of President Barack Obama leaving the White House for his departure on Marine One was taken by Matthew D'Agostino on July 1, 2015. In this photograph, the presidential helicopter is seen on the South Lawn as President Obama walks towards it. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of President Barack Obama leaving the White House for his departure on Marine One was taken by Matthew D'Agostino on July 1, 2015. In this photograph, the presidential helicopter is seen on the South Lawn as President Obama walks towards it. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of President Barack Obama leaving the White House for his departure on Marine One was taken by Matthew D'Agostino on July 1, 2015. In this photograph, the presidential helicopter is seen on the South Lawn as President Obama walks towards it. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of President Barack Obama leaving the White House for his departure on Marine One was taken by Matthew D'Agostino on July 1, 2015. In this photograph, the presidential helicopter is seen on the South Lawn as President Obama walks towards it. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph of President Barack Obama leaving the White House for his departure on Marine One was taken by Matthew D'Agostino on July 1, 2015. In this photograph, the presidential helicopter is seen on the South Lawn as President Obama walks towards it. Although presidents had used airplanes to travel for some time, helicopters were not adopted for use as presidential conveyance until the Dwight D. Eisenhower administration.

This photograph by White House photographer Paul Morse shows President George W. Bush waving before entering Air Force One on April 25th, 2001. President Bush was en route to New Orleans, Louisiana. The presidential limousine can be seen in the foreground.

This black and white photograph from June 5, 1933 features First Lady Eleanor Roosevelt. Mrs. Roosevelt was known as "Our Flying First Lady" for her embrace of air travel at a time when many Americans were leery of the still relatively new transportation method. She is pictured standing outside an American Airways airplane en route from Dallas, Texas to Los Angeles, California.

This photography by Warren K. Leffler, of "U.S. News and World Report," shows a helicopter carrying President Dwight D. Eisenhower leaving the White House for Gettysburg, Pennsylvania on May 20, 1958. The White House can be seen in the reflection of the helicopter window. President Eisenhower was the first president to use helicopters regularly for presidential transportation.

This photograph by Warren K. Leffler, of the U.S. News and World Report, shows a helicopter carrying President Dwight D. Eisenhower leaving the White House for Gettysburg, Pennsylvania on May 20, 1958. The East Wing of the White House is visible in the background. President Eisenhower was the first president to use helicopters regularly for presidential transportation.

This black and white photograph from March 1905 depicts President Theodore Roosevelt standing in between two unidentified men in front of a train. The photograph was possibly taken as President Roosevelt made his way back to Washington, D.C. from New York after attending the wedding of his niece Eleanor Roosevelt and future president Franklin D. Roosevelt on March 17, 1905. The two travelling with the president may have been Secret Service men. The Secret Service began fulltime protection of the President of the United States beginning in 1902.