Of all the "Uber for __" propositions, the splashiest by far was Blackjet, the app that purports to help wealthy users book seats on private jets (for a $2,500 annual membership fee). When it launched last October, the company touted A-list Hollywood investors like Ashton Kutcher, Jay Z, and Will Smith, not to mention connections to successful—or successful-seeming—companies like Uber. But sources tell Valleywag that Blackjet is in a tailspin—out of cash, unable to raise funds, and "basically over." Another source said: "They are fucked."