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In the US, some telephone companies such as A&T and Verizon have postponed the start of the 5G network in proximity to areas subject to airport attention because, on the part of some airlines, questions have been raised about possible interference between the fifth generation network (which operates on frequencies known as “C-band”) and on-board instruments (which operate on different frequencies but which in the US are close to those used for 5G), in particular with the radio altimeters needed for maneuvers such as landing in poor visibility or at night.