AAA Airlines (code TLA) was an Omaha based carrier, founded 1977.
By 1986 (that's the closest book I have) they had a fleet of 5:
- PA31 (Cargo)
- Cessna 404 (Cargo)
- DHC-6
- 2x EMB-110
Edit: going by the available info, the DHC-6 N177TA could have been the only larger airframe by 1984 as the Bandeirantes apparently came later.