Sorry, I don't know for sure but it was probably a zone focus. (When I track birds in flight, I use the centre 9 points, which is great against a clear background. You have to be very precise if you stick to the centre point.) Where the Nikon scores is that the AF recognises movement and so can pick up a moving object against a static background. I have been using a Sony RX10 IV as all-purpose travel camera and am very taken with its AF. It recognises objects and remains glued to them, be they flying or on the ground. Point the camera at a bird on the ground and its shape gets surrounded by little green dots in the viewfinder and it gets locked on as it hops around. The same is true for a flying bird. Canon should start using these more sophisticated algorithms.
I'll run this 80D for 2 or 3 more years and likely replace it with a 90D or 7D3 if they are available. (I have no interests in a mirrorless for what I do).
If the 7D3 has what I want I'll likely be shooting with it in a few years from now.....