A plane's top and bottom fuselages are installed with flashing red lights called beacon lights.
They provide a warning to ground personnel and other aircraft when an engine is starting, running, shutting off, or preparing to take off.
Because neon lights are visible at a great distance, it is used in neon discharge lamps and neon signs.
Neon signs are also used as beacon lights for the safety of air and sea navigation since their light has a superior ability to penetrate through fog and mist.
Therefore, beacon lights are obtained from neon lamps.