US Airways 1833 737-400 BWI to PHL, 89 miles. 16 minutes in the air on 24 Apr 2007. That is probably an error, since today's flight took 25 minutes and FlightAware shows it took about the best routing possible. Flown at 9000 ft altitude.
Recent days were reported at between 16 and 31 minutes.
The flight continues from PHL to Nassau, Bahamas.