Failed aircraft in the past, Promising now

Hello ACEOs
In this world of ever-changing environment, something a failure in the past could turn out as a promising one today. So, what are your favourite failed aircraft, but you think could be successful today?

Mine is Dassault Mercure!

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VFW 614

A regional jet before anyone needed/wanted one. Unique engine configuration as a bonus

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Yeah, it was unique, maybe it would be successful if they also added an Private Jet variant

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