responsibly plan for this deployment. verizon says officials figured out how to make 5g safe and fully operational in more than 40 other countries. even still, united airlines fears interference would impact operations at some of its be busiest destinations u houston, newark, los angeles, san francisco, and chicago. especially, to make sure that the airplane doesn t crash on the ground. this professor is researching 5g interference with radar altimeters at university in florida. one of the most critical systems in in the aircraft in helicopters, especially because it helps to land. reporter: low visibility and a malfunctioning radar altimeter led to a fatal 2009 turkish airlines crash just short of an amsterdam runway. the flight s auto-pilot acted like it was landing but in reality, it was more than 2,000 feet up. captain tager says there must be more time to review the data on