AT&T and Verizon have decided to limit the energy emitted by their 5G cell towers in response to Federal Aviation Administration's concerns over mid-band 5G potentially interfering with aircraft radio altimeters. Earlier this month, AT&T and Verizon pushed back the launch of their mid-band 5G to January 5, 2022, over issues raised by the FAA.

https://www.notebookcheck.net/AT-T-and-Verizon-decide-to-lower-energy-emissions-of-their-5G-base-stations-to-ease-FAA-s-concerns-over-mid-band-5G-waves-potentially-interfering-with-aircraft-equipment.581370.0.html