A Colorado couple died after their vintage airplane crashed in a Kansas field, according to the Kansas Highway Patrol.

A 1934 Waco YKC biplane, piloted and owned by retired airline pilot David Allen, 78, was traveling north around 6 p.m. June 30 when it crashed in a field in Sheridan County, Kansas, according to a Kansas Highway Patrol crash report. After crashing, the plane burst into flames. David Allen and his wife, Jeanne Allen, 79, died at the scene, the report states.

The couple lived at Kelly Air Park, a residential neighborhood in Elbert where pilots keep their planes in on-site hangars and takeoff using two neighborhood runways.

The circumstances of the crash are currently unknown, according to the Federal Aviation Administration. The incident is under investigation by the National Transportation Safety Board.

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