42. (1983) Following a meeting with your client at the airport lounge in Philadelphia, you’ll continue on down to Raleigh, NC. Three airlines offer nonstop flights on this route but you’ll be traveling on the least expensive one –
the only one to operate its aircraft in an all-Economy Class configuration while also still serving its cheapskate passengers a luncheon enroute. By now you surely know the drill – airline, aircraft, rank and serial number.
HINT:
This is the smallest jet serving this route.
HINT: It was not flown by US Air or any other major US airline
Saving the Best for last? 
About the only small jets in the inventory in 1983 were the BAC One-Eleven, Fokker F.28, and DC-9-10 ... having already ruled out US Air (the One-Eleven) and other majors (DC-9-10 operators EA, OZ, SO, and TW; 737 operator PI), and being highly confident that F.28 operator Empire didn't serve RDU, I'm figuring this had to be Best Airlines with a baby DC-9
Excellent deduction,
Detective 767! ^^ Best Air and the DC-9-10 are exactly, 100%
correct!
Best Airlines IW 743 Philadelphia (PHL) 1230p-130p L Raleigh (RDU) DC-9-10 X6