Bill Gates is accused of hypocrisy after joining bidding war to buy the world's largest private jet operator - one month before he releases his book preaching about climate change The Microsoft boss's company Cascade Investment entered the bidding war for British private jet servicing company Signature Aviation Friday Cascade teamed up with Blackstone Group to make a $4.3 billion bid Cascade and Blackstone now go head-to-head with private equity firm Carlyle Gates' Cascade already owns a 19 percent stake in Signature News of Gates' pursuit of the private jet firm raised eyebrows given its actions are at direct odds with his very vocal stance on climate change