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Confusing mismatched readings. >> what would you do? just go around -- >> and figure it out. >> and cause a big bottleneck. >> reporter: in a new letter, the ceos of boeing and airbus are telling the biden administration that interference from 5g trance mighters could adversely affect the ability of aircraft to safely operate. on capitol hill airline executives called it their number one issue. >> how concerned should passengers be? how scared should they be? >> the passengers will be safe, but it will be really damaging to customers. hundreds of thousands of customers a day impacted by this. ...

Interfere with key instruments that pilots use to land. in this simulator of a regional airliner, i saw how automatic warnings could stop and flight displays give confusing mismatched readings. what would you do? just go around and figure it out? >> cause a big bottleneck. >> reporter: in a new letter, c.e.o.s of boeing say that 5g cell transmitters could adversely affect aircraft to safely operate. on capitol hill last week, airline executives called it their number one issue. >> how concerned should passengers be, how scared should they be about this? >> the passengers will be safe, but it...

Rollout of 5g. cnn's pete muntean is with us. >> it's the new thing that could impact your safety in the sky. the soon-to-be turned on phone service could impede the service pilots use to land. the displays could have confusing, mismatched readings. >> you would just go around and cause a big bottleneck. >> in a new letter, the ceos of boeing are telling the biden administration that signals near airports could affect the ability of airplanes to safely operate. on capitol hill last week, airline executives called it their number one issue. >> how concerned should passengers be? how scared shou...

Asking president biden to ground the rollout of 5g cell service, which is scheduled to launch next week, with much faster service. but ceos are warning that 5g's signals could interfere with vital safety systems. as cnn's aviation correspondent pete muntean reports, this could give airplane mode a whole new meaning. >> reporter: it is the newest issue that could impact your safety in the sky. airlines are warning that radio waves from soon to be turned on high-speed phone service could interfere with key instruments that pilots use to land. in this simulator of a regional airliner, i saw how a...