The chief executives of America's largest airlines warned of a catastrophic disruption" to travel and shipping operations if telecommunication companies roll out their 5G technology as planned Wednesday without limiting the technology near U.S. airports. On Tuesday, AT&T and Verizon both confirmed to CBS News that they have voluntarily agreed to postpone turning on a limited amount of towers around certain airports. "We are frustrated by the FAA's inability to do what nearly 40 countries have done, which is to safely deploy 5G technology without disrupting aviation services, and we urge it to do so in a timely manner," an AT&T spokesperson said in a statement, reiterating that the rest of their 5G launch will continue as planned. The executives, writing to Transportation Secretary Pete Buttigieg and other U.S. government officials, highlighted the risk of "economic calamity" should Verizon and AT&T proceed with deploying the new technology before the necessary upgrades and changes have been made to aviation equipment. "We are writing with urgency to request that 5G be implemented everywhere in the country except within the approximate two miles of airport runways as defined by the FAA on January 19, 2022," the CEOs said in a Monday letter. "To be blunt, the nation's commerce will grind to a halt," they said. The letter was signed by CEOs of major airlines including American, United, Delta and Southwest, as well as the leaders of shipping giants FedEx and UPS.