How to pronounce “transonic” in English

And it's really a trajectory that's not completely a trajectory of his own, because if you're looking at what's happening to the history of flight,over the course of the '40s and '50s, you're having the move from subsonic to transonic to supersonic to hypersonic flight.That's happening. And since Neil's in a position where he's employed to be testing these vehicles as they're coming online to be tested, Neil goes with that trajectory.