Reuters reported on January 18 that the CEOs of several large passenger and cargo airlines in the United States warned that the 5g service to be promoted by ATT and Verizon may trigger an aviation crisis. According to reports, these airlines said that the new C-band 5g service scheduled to be put into use on Wednesday may make a large number of wide body aircraft unusable, resulting in flight chaos in the United States, "tens of thousands of Americans will stay overseas". The CEOs of American Airlines, Delta Airlines, United Airlines and Southwest Airlines wrote in a letter: "if large air transportation centers cannot operate normally, most flights will be grounded." On Sunday, the CEOs of several airlines and Boeing held a teleconference with U.S. government officials to discuss possible crises. Airlines agreed to deploy 5g in the United States, but did not accept the deployment of about 3.2 kilometers near the airport runway. They suggested that immediate measures should be taken to avoid operational disruption. On January 3, ATT and Verizon respectively announced that they agreed to postpone the deployment of 5g services for two weeks and postpone the deployment date to January 19. In addition, they also agreed to set up buffer zones near 50 airports to reduce the risk of interference and take other measures to reduce interference. The two companies were originally scheduled to launch a new 5g network on January 5, but under pressure from the White House, airlines and aviation unions, the aviation industry said that 5g may interfere with sensitive aircraft electronic equipment, such as radio altimeters, thus endangering flight safety. (Xinhua News Agency)