I have been to an air show at Wright Patterson AFB. That complex is massive. I think you could hide anything there. Makes sense to me. Right under
everybody's noses.
Just my two cents worth. Have everybody searching the desert and countryside and the big show is right in Ohio.
The Manzano Mountains, outside of Kirtland AFB. They are hollowed out, but empty now since a nuclear accident a few years back. from what I was told
by someone who helped clean it up, There was a bunch of dead chimps everywhere.