5G interferes with the Radio altitude of planes which is what pilots use when landing. A loss of RAD ALT can make it harder for a pilot to judge a landing, thus making it unsafe.,(reply>), @FastSloth87 yep and some 5G’s (C-Band) utilize 3.7-4.0GHz, which is dangerously close to radio altimeter communication waves,(reply>), @BluMac Radio altimeters operate in the 4.2-4.4 GHz band.,(reply>), @Alex Atkin yea probably not all 5G frequencies interfere. I think it depends on how high the frequencies are because planes use VHFs (Very High Frequencies) for literally everything radio related,(reply>), Surely that entirely depends on what frequency is being used as 5G can use the same ones as 4G or 3G does so shouldn't be any worse.