would cause, although airlines up and down have said this would be a huge issue. >> let's back up, pete. why is 5g high-speed internet potentially dangerous when it's close to airports? >> the issue here is the radio spectrum. it's called the c-band. and what happens is the 5g network is so close on that radio frequency spectrum to what are called radar altimeters. sensitive instruments on board commercial airliners, cargo planes, helicopters. particularly important for commercial airliners because it is used, sends a radio beam to the ground and back up to get a hyperaccurate reading of how high the plane is above the ground which is used in critical phases of flight, especially when the plane is very low to the ground when the visibility is the least. so this is a real problem the airlines say. in fact, united's ceo called it the number one safety issue for the airline and that it will not compromise on that. >> the airlines are warning this could create enormous scheduling