West Berlin's special legal status during the Cold War era (1945-1990) meant that all air traffic through the Allied air corridors linking the enclave with West Germany was restricted to airlines headquartered in the U.S., the U.K. or France, and all flight deck crew flying into and out of the city were required to hold American, British, or French passports. The West German airline Lufthansa and most other international airlines were not permitted to fly to West Berlin.
Special Air Mission (SAM) 26000 was the first Boeing VC-137C U.S. Air Force (USAF) jet aircraft, a customized and specially maintained B707, specifically for the use by U.S. Presidents. SAM 26000 was the plane that brought John F. Kennedy to Berlin in June 1963, and that carried Lyndon B. Johnson, Jacqueline Kennedy, and Kennedy's body back to Washington on November 22, 1963. In May 1998, it was flown to the National Museum of the USAF at Wright-Patterson AFB, where it is on permanent display in the museum's Presidential Hangar.
This episode takes place in June 1963.
The title of this episode is also a famous statement by US President John F. Kennedy during his speech at the Berlin Wall in 1963. English translation " I am a Berliner."
Much ado is made of JFK's "Ich bin ein Berliner!" meaning "I am a jelly donut!" In a way, it's true but it is an easy mistake. If he sought some assistance from a German-fluent staff member, her would have said "Ich bin Berliner!", which is correct.