In commercial aviation there was almost no cosier relationship than that of Swissair and McDonnell Douglas which spanned decades from the 1930s to the 1990s so when the airline turned its back on the latest -and longest- version of the DC-9/MD80 family, the MD90, it prompted Flight International to headline the news as a “stretch too far”.
One of the other great enduring aviation relationships is that of United Airlines with both McDonnell Douglas and Boeing. United launched the DC-6, was the second customer for the DC-8 and DC-10 and was the launch customer for the 727, 737 and 777.
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Source:: AirlineRatings.Com