disruptions, thousands of flight cancellations they say. what is at issue here is that the 5g radio spectrum operates on a similar spectrum to what is called a radar altimeter. that s an instrument in commercial airliners and cargo planes and helicopters that beams a radio wave up, giving a hypersensitive look at how high an airplane is above the ground, and this could cause errors in that instrument, these airlines say. so they have set this lever, ten airline ceos, to the department of transportation and the biden administration calling for immediate action here. this rollout was already delayed by two weeks. they say it should be delayed again. and in this letter, they say the ripple effectings across both passenger and cargo operations are workforce and the broader economy are simply incalculable. to be blunt, the nation s commerce will grind to a halt. a white house source tells me there are talks taking place right now between the fcc,