PHL Approach
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I've heard others that make no sense whatsoever...like "WaterSki." Now there's a great call sign for an airline.
Trans States first started out serving Lake of the Ozarks. Waterskiing was a big thing there so that's what became of it.
I don't think this exchange would go over to well on the comms. "Tranny 2310, pull up and hold short, be ready to go"
If US would install UA's option of Channel 9.