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they are using their radio call sign https://en.wikipedia.org/wiki/Call_signs_in_the_United_States https://en.wikipedia.org/wiki/Call_signs_in_the_United_State.
by airza 3y ago
they are using their radio call sign https://en.wikipedia.org/wiki/Call_signs_in_the_United_States https://en.wikipedia.org/wiki/Call_signs_in_the_United_State...