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  1. McDonnell Douglas DC-9 - Wikipedia

  2. Everything You Need To Know About The McDonnell Douglas DC-9

  3. 59 Years Since Its First Flight: Who Still Operates The DC-9?

  4. A Brief Guide To The McDonnell Douglas DC-9's Main Variants

  5. McDonnell Douglas DC-9 - Delta Flight Museum

  6. The Douglas DC-9: The Little Twinjet That Roared

  7. McDonnell Douglas DC-9 - Wikiwand

  8. DOUGLAS DC-9 - Plane & Pilot Magazine

  9. Aircraft By Type - Delta Flight Museum

  10. McDonnell Douglas DC-9 Flies Into Retirement - NPR

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