The Airline History Museum preserves U.S. airline and commercial-aviation history through aircraft, memorabilia and the Hangar 9 collection at Kansas City Downtown Airport, including the museum's historic Lockheed Super Constellation and Douglas DC-3. The operator's current notices state that the public Hangar 9 museum is temporarily closed because of actions by Signature Flight Support while the board works to reopen the destination; the collection's identity and historic site remain documented.