Drawing on location

Over the last few months I have tried to get out and draw in different places.  My schedule doesn't always allow it.  In May, I went to the New Jersey Aviation Hall of Fame over at Teterboro Airport.  They've got a bunch of old airplanes, helicopters and trucks on display.  It's a great place to draw if you like heavy machinery.  This drawing was done in pencil, with digital color added at home.