T is your transponder, or squawk code. This helps Air Traffic Controllers identify you.
"Horizon 69 is cleared to Seattle Airport via PORTLAND ONE SID ASTORIA transition. Climb and maintain 3,500, expect FL190 10 minutes after departure. Departure frequency is 134.25. Squawk 6281."
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Flight Sim Tips - C.R.A.F.T: Copying IFR Clearances
Non-FictionA simple way to copy IFR clearances!
