A bit more to add to PresRDC's excellent data
One of the great parts of the EA shuttle was that you did not need any kind of ticket (pre security days) just walk on the flight and buy you ticket on board - very cool. Plus, in the early 80's they had a coordinated arrangement with New York Helicopter Airways which would run you to the Pan Am building (prior to loosing a rotor blade on the top of the building!!) so basically about 75 minutes from K Street in DC to Midtown - VERY VERY VERY cool.
It was all econ and row 1 is where the likes of Henry Kissinger would be seated.
Further, do not forget New York Air and the flying nosh - they were actually my favorite on the route!