A flying vehicle in coh already exists, the rocket board is quite literally a flying mount. Model swapping it to anything else is easy enough. A car is different, they could absolutely do a model swap that makes it so you can't jump and has weird movement changes but the game wasn't designed for a car. The layouts don't actually go places half the time and there is no direct route to large chunks of the game for a car and you really wouldn't want it used in doors. It's completely impractical for real use. At best, you'd be able to move around in the car for show. It'd never make sense as a power pool ability though, it'd need to be a temp power to excuse this game not being setup for its use as a real travel power.