here s tom costello. reporter: just 36 hours before verizon and at&t switch on their new faster 5g cell systems, the nation s airlines today issued a stark warning. an urgent request signed by every major u.s. airline and cargo ceo for the government to keep the 5g ground stations turned off if they re within two miles of major airports the ceos write immediate intervention is needed to avoid disruption to air passengers, shippers, supply chain and delivery of needed medical supplies 50, 40, 30. reporter: the concern, those 5g ground stations could disrupt a plane s radio altimeter which provides precise altitude readings when pilots land in poor visibility as 5g goes live wednesday, the faa will prohibit pilots from using altimeters, including large airport hubs in dallas, new york,
reporter: it is complicated and as everything it s very nuanced, but the airline and cargo airline ceos are all warning of economical amity, catastrophic disruptions if the 5g rollout goes forward around the nation s airports. the entire aviation industry is very concerned that 5g will disrupt the critical cockpit systems. united airlines this morning warning that it could negatively effect one in a quarter million united passengers, at least 15,000 flights and tons of cargo. the cellphone industry insists all of the research suggests 5g is safe, but all of this now, 5g goes live at midnight. 50, 40, 30. reporter: it s the critical technology pilots rely on for precise altitude readings when landing in poor visibility, the radio al timter, but the faa, the airlines, pilots, boeing and airbus have all warned the new faster 5g cell systems could
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