It's not that easy to exhaustively test that the many different 5G systems won't accidentally corrupt radio altimeter signals. It's been in the works for a long

It's not that easy to exhaustively test that the many different 5G systems won't accidentally corrupt radio altimeter signals. It's been in the works for a long time, and aviation and telecom groups have cooperated on this worldwide. It's why everywhere else, there are either mitigations on 3.8-4.0GHz frequency use near airports, or the spectrum is not allocated to 5G comms. Then, quite recently in the whole development, FCC decided to allocate 3.8-3.98GHz to telcos, without mitigations near airports