When a tower air traffic controller can't speak (sudden onset of pneumonia or a bit of jelly doughnut stuck in the throat), or the pilot can't figure out the avionic switching panel, ATC resorts to 1930s technology and flashes light signals at the aircraft to convey instructions. What does flashing green mean to a pilot in the air?


Give way to other aircraft and continue circling


Go around


Return for landing


Cleared to land

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