That's a return measured at the sale, upon exiting the investment. That may well be what DAC aims to achieve, though there's not a very good track record of that in this sector of aviation (ask HIG, who had the same hopes when they bought FO from RTN, or even uncle Warren for that matter with NJA's historic returns). These guys are talking about past annual operating returns in the 15% range which, if true, would have make the company unaffordable for DAC. AAPL is in the low 20's, for Pete's sake; LUV has been 3-5%. KR only buys low, and with other people's money, and a company consistently returning 15% would be expensive. But then what do I know?
Past history would indicate that KR and his inner circle will do fine in the deal, outside investors not so much, and rank-and-file employees worst of all. But don't worry, Flex is special and I'm sure this time is different.
Old poker proberb: If after ten minutes at the table you do not know who the patsy is - you are the patsy.