Originally Posted by
jlemon
However, the DC9-30 was one of the aircraft types that the airline in question would have operated from Midway.
Right, let's see if I can nail this one.
As far as I can predict (not having a 1977 timetable) the only DC-9 operators at the time who ran into O'Hare were Allegheny, Delta, Eastern, North Central and Ozark.
Allegheny, North Central and Ozark have already been dismissed.
It's stated that the airline is established at ORD so no new operator.
That leaves Eastern and Delta.
It's stated that the aircraft to be used are DC-9, and later that the DC-9-30 was ONE of the types. Delta only had the DC-9-30 by 1977, having sold their shorter ones, while Eastern by 1977 had the DC-9-10, DC-9-30 and DC-9-50. Three types.
So I go for Eastern, with those three types.