Hard to believe the RoI was poor based on the numbers.

And with only ~16% and a single seat on the board at stake I'm not sure anyone could effectively implement a "scorched earth" policy that would destroy the company.

The ATI++ arrangement with UA, AC and others makes the utility of B6 as a feeder and partner somewhat lower. And there's not much of a need for LH to try to snag some extra JFK slots from the B6 portfolio these days. And it also wasn't long ago that LH acknowledged they were mostly just buying the stake because they saw an upside to the B6 business model and the currency rates at the time.