The flying sequences under the direction of Anthony Squire, were based at the Vickers aerodrome at Chilbolton near Nether Wallop in Hampshire. Squire managed to secure one of the last airworthy Avro Lancaster bombers for the task. The cameramen were positioned in the front and rear turrets while Squire conducted proceedings from the central astrodome. The Lancaster was replaced by a Vickers Valetta after all the crew except Squire fell asleep due to an oxygen supply failure. Luckily as he recalled, "They all woke up on the way down, like people in a fairy wood, but I didn't bother with the Lancaster again."
The film refers to control-reversal above the sound barrier: that the pilot must push the stick forwards to make the plane climb. This is not a universal aerodynamic phenomenon that applies to all supersonic airplanes and was only a quirk of early ones which had insufficient tailplane stiffness, so the elevators (which control climbing and descent) act as though they were trim tabs, twisting the tailplane to produce an aerodynamic effect opposite to that intended. It is control-reversal which Chuck Yeager referred to when he said that any pilot who tried it in other supersonic planes would have been killed.
When Tony and Susan return from Cairo, it can clearly be seen that the Comet that they fly in has rectangular windows. Extensive redesign after crashes in 1954 - due to metal fatigue - included the windows being changed to an oval shape.
Sir Ralph Richardson and Ann Todd were cast as father and daughter, despite the fact that in reality there was little more than four years between them.
The cinematographer Jack Hildyard invented a two-headed camera for this film when the camera operator stated he couldn't pan fast enough to capture a jet on a low fly-past. One head captured the approach while the other, at 180 degrees to the first, captured the subsequent departure.