An aircraft warning is a sign, signal, light, or marker used to alert people on the ground or in the air about the presence, movement, or risk involving aircraft. These warnings are used to ensure the safety of both aircraft and people, especially near airports, military zones, or tall structures.
Warning for aircraft. Warning for a level crossing with barriers. (Payerne Air Base, Switzerland) © Wikimedia.org/Marc Mongenet, CC BY-SA
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