ADI Aerodynamics (Pontiac Oakland County International) has confirmed that American Airlines, Delta Air Lines, and United Airlines have cancelled their respective interline agreements with Great Lakes Airlines (Cheyenne) following its decision to terminate operations late last month.

Prior to its sudden collapse, Great Lakes Airlines had sold tickets for ADI-operated scheduled flights between its Denver International hub and each of Watertown, SD and Pierre. The Great Lakes Jet Express -branded flights, which were handled by Great Lakes' staff in Denver and Pierre, had carried Great Lakes' "ZK" flight code and were identified in the Global Distribution System and Online Travel Agencies as Great Lakes Airlines flights. The partnership had allowed ADI to expand the marketability of the flights by virtue of Great Lakes' partnership with the three legacy carriers.

However, despite Great Lakes' assurance on Monday, March 26, that it would continue to support ADI's flights, American, Delta, and United have now terminated their interline deals with the carrier with a knock-on effect on ADI.

"As a result of this action, ADI will no longer be able to offer through ticketing or through baggage transfer," it said. "ADI is working to try and establish its own agreements with these major carriers, but that may take some time and is not assured."

In the meantime, other entities that have been impacted by Great Lakes' demise have started taking steps to resume regular operations.

According to the Wyoming Tribune-Eagle newspaper, city fathers at Cheyenne Regional Airport have already engaged several carriers to ensure continued service to the airfield.

Among the three options being studied include Allegiant Air (G4, Las Vegas Harry Reid) starting a 2x weekly service to Las Vegas Harry Reid, which would cost an estimated USD3.3 million in baseline subsidies per annum; a 2x weekly flight on Allegiant Air to Phoenix Williams Gateway, costing USD2.6 million per annum; and a 2x daily service to Dallas/Fort Worth on SkyWest Airlines (OO, St. George Municipal) with a minimum revenue guarantee of roughly USD4 million.

The committee has until June 24 to decide on whether or not they intend to commit financially to maintaining scheduled air service.