The flyer lifts off. T'Challa stays where he is, watching, until it vanishes in a streak across the sky, then goes back inside with Okoye. They'd all discussed this, too: while it's not likely that they're being observed, it's best to be careful and not be seen leaving immediately.

Besides, not only is there no way that the flights 'Kruhl' and 'Devlin' will be taking can outpace Wakandan technology, he already knows where they're going.