HOXIE, Kan. — Authorities are investigating the crash of a vintage biplane in northwest Kansas that killed two Colorado residents. The 1934 WACO YKC single-engine biplane crashed into a field around 10 miles (16 kilometers) north of Hoxie in Sheridan County around 6:10 p.m. Sunday, the Kansas Highway Patrol said. The Patrol identified the pilot as David Allen, 78, of Elbert, and the passenger as Jeanne Allen, 79.