distance from the ground. airlines say in poor weather conditions, when visibility is low, pilots might not have reliable information to land safely, potentially leading to thousands of diverted and canceled flights and not just for passengers, but cargo, too. >> the faa cannot tell us if there is a problem. the airlines are erring on the side of safety to make sure that it is scientifically determined that there isn't a problem and the flying public stays particularly safe. >> reporter: the wireless carriers have long said 5g would not interfere with aircraft electronics. at&t saying in a statement, "we are frustrated by the faa's inability to do what nearly 40 countries have done, which is to safely deploy 5g technology without disrupting aviation services." the faa says other countries have created permanent "buffer zones," keeping the signal away from airports, but the signal in the u.s. would be more than twice as strong as those used in europe. our mary bruce asking the