Rather than the published hold, we're given a series of headings that form an informal hold and wait. Margrit brings the power back and we orbit at 130 knots. Even though we've been in the air over three and a half hours, we've still got plenty of gas. Margrit reassures me that Prestwick is only 10 minutes away, but that the fuel deal is better at Glasgow. I get the Prestwick weather, just in case. It is: wind 250/20 knots, 5 km vis. 700 broken, 1,600 overcast, temp 14, dew point 12. Margrit calls unicom and talks to Mark at Signature. He fills us in and estimates that it will take 20-30 minutes to clear the runway. We leave comm two tuned to Signature and soon learn that a tug has been dispatched to tow the jetliner off the runway. A few minutes later, the approach controller on comm one tells us that a tug has been dispatched. "We know," I reply.