What do green lights mean at an airport?

Threshold lights are green color airfield lights, unidirectional type, installed at the beginning of the part of a runway where aircraft can do touchdown. Threshold is not a touchdown point yet. But this is a beginning of 'safe-to-land' part of a runway.



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Short answer: a blue light typically indicates a passenger has pressed the call attendant button above their seat.

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In the United States, for example, landing lights are not required or used for many types of aircraft, but their use is strongly encouraged, both for take-off and landing and during any operations below 10,000 feet (3,000 m) or within ten nautical miles (19 km) of an airport (FAA AIM 4-3-23).

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