Several proposals for extending the route of the "Heartland Flyer", or providing additional service over all or parts of its route, have been made over the years. Expansion planning revolves around portions of the former "Lone Star" route; as well as the line between Oklahoma City and Tulsa, Oklahoma. The only concrete proposal regarding the OKC–Tulsa line, the Eastern Flyer, fell through in August 2019 when the Stillwater Central Railroad, purchaser of the line from the State of Oklahoma, opted to default under its agreement with the State and pay the contractual $2.8 million penalty for not establishing passenger rail service.