How do you create a seamless transition from gimbal to drone?

Does anyone have any idea how the first shot of this trailer was made? Link to the trailer: https://youtu.be/HNniWa-uM2E Is it possible to pull it off with only ronin and a drone?

I need to create a similar effect for a commercial and so far haven't managed to make a seamless transition between the interior shot and the drone shot! I am at my wit's end!