Question: What was an American regional airline called when it was founded in 1982, that company acquired a carrier operated a mixed fleet of Beechcraft 1900, Piper Navajo Chieftains, Beech 99 Airliners, and also occasionally utilized a Beech King Air 90 as a back-up aircraft?
Sentence (from "Business Express Airlines"): This opened the valuable New York and Washington, D.C. markets.
Relevant evidence: No