The sound comes from the electronic cabin chime system used on commercial aircraft to alert passengers when the fasten seatbelt sign changes. It has become familiar to frequent flyers through countless real journeys, rather than through a single film, show or meme origin. Online, short clips of the chime circulate as a ready-made travel cue, shared by editors who want an instantly recognisable airport or in-flight moment without recording a plane themselves. Its continued use reflects how strongly one brief ding is tied to the feeling of a journey beginning or ending.