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Bell is owned by Textron, which being an American publicly-traded company, is focused primarily on short term (i.e. this quarter's) profits. Selling their share of AW139 program allowed Bell to keep their numbers up, and that helped Textron keep their numbers up. For a while at least!
Would be interesting to know what Bell's executive row thinks of the idea, now that the AW139 is selling as fast as Agusta can crank them off the line. And how would the 139 have sold in the US with Bell's name and product support behind it?
Meanwhile, Bell is left with the 412