It failed because it did not make a profit, period. Talk of lack of investor support avoids mentioning this simple and obvious point, a point most people miss who know little about the economics of this business. Unfortunately the investors probably knew little about this business before they started or they would not have ventured into it. People never believe the saying that the only way to make a small fortune in aviation is to start with a large one. There are always gullible investors sold the dream with outrageous computer projections sold by the armani suited brigade. (I am not saying that this was the case with Ambeo).