A stands for altitude. This is not only your initial climb altitude, but when to expect your cruise altitude.
"Horizon 69 is cleared to Seattle Airport via PORTLAND ONE SID ASTORIA transition. Climb and maintain 3,500, expect FL190 10 minutes after departure."
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Flight Sim Tips - C.R.A.F.T: Copying IFR Clearances
Non-FictionA simple way to copy IFR clearances!
