By early 1984, the airlines had added Convair 580 turboprops to the fleet and was operating Miami (MIA) - St. Petersburg (PIE) - Atlanta (ATL) service.In an unheard of move by a small airline in the 1980s, Atlantic Gulf continued to operate using a British Aircraft Corporation BAC One-Eleven jet it acquired through a merger with the also bankrupt Air Illinois.[2] The airline had acquired two former Cascade Airways BAC One-Eleven twin jets and began scheduled service from Tallahassee to Miami/Fort Lauderdale and Atlanta.[3] In addition, Piedmont Airlines had started its well equipped and well funded dedicated Florida Shuttle using comparable Fokker F28 Fellowship twinjets.Years after it folded, in a case that went before the U.S. Supreme Court, Atlantic Gulf won their lawsuit against the FAA over the transfer of Cascade Airways "Stage One" noise waivers.