The us. Aviation authority cancelled over 600 flights to the us, last week siting air safety concerns associated with five g. Radio altimeters are censors onboard an aircraft capable of assessing the clearance height above terran and other obstacles. For instance, it can tell you when you're flying too low and avert a disaster. Even though they operate in a fixed band that doesn't overlap with a sea band, they are susceptible to interference from these adjacent frequencies as well.