Only one ever made, as it was the loser in a development program.
See picture, and story, on these links about the McDonnell 220
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Last known to be at El Paso International
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I think that may be one of the most beautiful planes I have ever seen!
Engines: 4 x Westinghouse J34 of 2,980lbs Max speed: 560 mph Cruise: 520 mph Range: 3,000 sm Ceiling: 45,000 Loaded weight: 41,000 lbs (est) Span: 57' 7.25" Length: 66' 6" Height: 23' 7.75" Area: 550' sq