Airplane cabin chimes have been part of commercial air travel for decades, signalling that passengers should listen for crew instructions, fasten seatbelts or prepare for landing. As travel vlogging, flight simulation and reaction editing grew online, creators began lifting the familiar two-tone sound for short clips, using it as shorthand for flying, travel or an official announcement. It spread because almost everyone recognises it instantly, even without seeing a plane. Today it remains popular as a quick, clean cue that sets up humour, news or a dramatic pause.