Re: [OM] Tetrachromacy

[Ken Norton]

Color vision is also required for pilots because of the legacy airport
control tower light signals.

BTW, Anchorage has, I believe, the only Class-D airspace (Merrill and
Lake Hood airports) that does not require two-way radio
communications. It's quite the delicate dance as the Class-D airspace
is a combination of horizontal corridors that sneak the airplanes in
and out under and over each other while literally getting shadowed by
747s.

AG
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