page_title: Waco Mailplanes
section_title: Operational history
hierarchical_section_title: Waco Mailplanes / Operational history
caption_attribution_description: English: Waco JWM mailplane built 1929 preserved at the Historic Aircraft Restoration Museum, Dausrter Field, St Louis, Missouri
context_page_description: The Waco Mailplanes are a range of two US-built open-cockpit mail biplane designs of the late 1920s.
context_section_description: Four Waco JYM aircraft were delivered to Northwest Airways (later Northwest Airlines) in 1929 and were operated by them on the 892-mile CAM-9 airmail route from Chicago to Minneapolis via Milwaukee, Madison and La Crosse. All four Waco JYM's still exist, with the third JYM NC631N on display in airworthy condition in the Historic Aircraft Restoration Museum (HARM) at Dauster Field near St Louis, Missouri, wearing its 1929 NWAL CAM-9 route markings.  
  One Waco JWM aircraft was built. The sole survivor NX8550 is also preserved at HARM, wearing the markings of the "Art Davis Air Circus".
caption: Waco JWM straight-wing mailplane of 1929 in the markings of "Art Davis Air Circus" displayed at HARM near St Louis in June 2006
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