I guess it was Republic by then, wasn't it? I also thought the USAir (or USAirways; I don't remember the timing of that change, either) kept AL* for the commuter operation, so I'll make some minor modifications there.
Next round, then:
1A
ATY-MSP, RC, D9S
MSP-ORD, UA 737
ORD-SYR, AA 72S
SYR-ART, US* B99 (or BE9, another code that changed over the years)
1B
ART-SYR, US* B99 (same disclaimer)
SYR-ORD, AA M80
ORD-MSP, NW D10
MSP-FAR, NW 727
FAR-ATY, RC CV5