R is your route, or your Standard Instrument Departure (SID) and transition. This comes after your clearance limit and the clearance now is as follows:
"Horizon 69 is cleared to Seattle Airport via PORTLAND ONE SID ASTORIA transition."
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Flight Sim Tips - C.R.A.F.T: Copying IFR Clearances
Non-FictionA simple way to copy IFR clearances!
