5G telephone networks may interfere with radio altimeters on certain airplanes, according to the US Federal Aviation Administration. These are essential for low-altitude landings and landings in poor visibility. Nonetheless, the FCC has approved the deployment of these networks, including phone towers near airports. The radio spectrum is a scarce public resource in the US. As a result, industries fight hard to get their share. This is because the frequency section designated for critical airplane operations is quite near to the US 5G spectrum.