KPHL, On departure, there is no conveinent place to do a runup (once you're in
the taxiway system), so ask first where to do it so you don't block traffic. I
didn't know this and expected to do a runup at the departure end of the runway.
Well, it was tight, and a few bizjets squeaked by while I was doing it; this
was clearly not the preferred method.

Jose

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