Diagram of the <a href="https://en.wikipedia.org/wiki/1972_Chicago-O%27Hare_runway_collision" class="extiw" title="en:1972 Chicago-O'Hare runway collision">1972 Chicago-O'Hare runway collision</a> showing paths of Delta Airlines Flight 954 (dotted line) and North Central Airlines Flight 575 (dashed line)
United States <a href="https://en.wikipedia.org/wiki/National_Transportation_Safety_Board" class="extiw" title="en:National Transportation Safety Board">National Transportation Safety Board</a> (unattributed)
1973-07-05
National Transportation Safety Board Report Number NTSB-AAR-73-15 “Aircraft Accident Report North Central Airlines, Inc., McDonnell Douglas DC-9-31, N954N, and Delta Air Lines, Inc., Convair CV-880, N8807E, O’Hare International Airport, Chicago, Illinois, December 20, 1972,” adopted July 5, 1973, Page 29, at <a rel="nofollow" class="external free" href="http://libraryonline.erau.edu/online-full-text/ntsb/aircraft-accident-reports/AAR73-15.pdf">http://libraryonline.erau.edu/online-full-text/ntsb/aircraft-accident-reports/AAR73-15.pdf</a>