I am still curious as to why the check box is gone?
I did find the option in the ini for an airport, once created. This is is very inconvenient since you have to open a text editor while in the sim, or exit, edit and re-start.
Again, the manual still implies that the check box for this should be present.
P3D v3.4.18.19475 in Win 7 64
Joe L.