The API is already there. All it does is push you out of the map app to a third party app and give the third party app the start and end points of the journey.
That's useless in many cases. It also doesn't give you things like live GPS tracking to see where you are during the journey without having to switch app back and forth constantly, which is a huge pain in the ass.
wtf? wow... smh. for some reason i imagined 3rd party apps being able to hook into apple's maps and display the routes there.
they should just give up this stupid fight with google cause they're literally making a WORSE user experience for everyone. i can't even think of a single use for flyover view. it doesn't come close to how useful street view was on my ipad.