Any issue you might have will be the LiPo batteries, rather than the quad. Check with the airline as many have both a maximum number allowed and also a discharge threshold which all batteries have to be below.
I guess I and others assumed as carry-on luggage..As others noted the LiPo(s) are a potrential problem, but I often wondered about the blades, I used to transport them in check-in but no longer bother with that either. (although I'd have my doubts about carbon props.
I've taken my phantom through Sydney Airport quite a few times. It raises a few eyebrows and they may want to have a physical look, but it should be okay as carry on.