Airpack in Seattle has been going for some time then, was operating at least back in 1983/84, with the equipment described.
Airpac in Alaska must have been one of the first operators of the BAe 146, they had one in 1983/84. They must have had a bad run with it as they claimed it nearly put them out of business. Tried to sue BAe over that problem, BAe counter-sued I believe. I don't know the outcome. They had a mixed fleet. I was working as an aircraft mechanic for a company that refurbished a Fairchild FH-227 for them. I don't know if they're still in business