The Bridge at Kang So Ri - S5-E18
Trivia: When Harm is landing the 747, there is a camera shot of Air Force One. (The Presidential seal which is located near the forward doors is briefly visible) There is also a scene immediately afterwards of vehicles following the plane on the runway. These two scenes are from the Harrison Ford movie, Air Force One.
Ghosts of Christmas Past - S5-E11
Trivia: When the intruders go up to destroy the SAM depot, most of the scenes are reused from the movie Flight of the Intruder, including the SAM launch, some of the AA fire, and radar tracking.





Chosen answer: When landing on an aircraft carrier, a pilot "calls the ball" by confirming to the landing signal officer (LSO) that they have the carrier, and more specifically its landing guidance systems in sight. Carriers use a Fresnel lens system which is a light only visible at a certain angle, so if a pilot sees the "ball" they are at the correct altitude and glide slope for landing.
Sierra1 ★