Hey, that’s really awesome!
Unfortunately the 3D airport development system in Infinite Flight is currently unknown or kept confidential. Though there is currently no way to share your 3D development work with the developers, the best we can do this point is let them do what they do best; find a solution.
I’m sure somewhere down the road there are plans to allow community members to design their airports (similar to IFAET), but if there any plans for this they have been kept unannounced.
Thanks!