39N (three-niner-november) is the airport code for the Princeton Airport, a small, one-strip field just outside of Princeton, NJ It is home to (among other things) the Raritan Valley Flying School, where yours truly soloed for the first time. The runway is aligned as Runway 28/10 (runs from 280 degrees to 10 degrees on the compass). Full services are available (fuel, maintenance, etc.) and the field operates turbine aircraft as well as small prop planes such as the Cessna 152, 172 and 182 aircraft operated by the flying school.
There is also a rotorcraft instruction school at the airport, whose name I cannot now remember.