Remove before flight - Wikipedia

What are those REMOVE BEFORE FLIGHT tags?

411 Remove Before Flight Images, Stock Photos, 3D objects, & Vectors

Airbus A380 - Wikipedia

File:Aalto-1, flight model (2) crop.jpg - Wikipedia

LAPA Flight 3142 - Wikipedia

Rotary13B1 Remove Before Flight Lanyard - with Detachable Safety Buckle : Office Products

Takeoff - Wikipedia

History behind the Remove Before Flight Phrase

Aviation safety - Wikipedia

File:Air France Industries Remove Before Flight Keychain.jpg - Wikimedia Commons

File:Former USAF McDonnell-Douglas F-4E Phantom (67-0237) painted in RAAF No 82 Wing livery at the RAAF Museum.jpg - Wikipedia

Remove before flight - Wikipedia

Flight instruments - Wikipedia