For the third time in less than two months, the U.S. aviation system has faced the threat of widespread flight disruptions over potential 5G interference — only to get a temporary reprieve.

A last-minute accord between wireless telephone companies and aviation authorities Tuesday averted major disruptions but didn’t eliminate them. Left to be worked out is a long-term solution that will enable mobile phone companies to take advantage of super fast wireless technology without interfering with aviation.

AT&T Inc. and Verizon Communications Inc. agreed to temporarily delay switching on hundreds of 5G cell towers near U.S. airports in talks with the Federal Aviation Administration and other government officials. The towers broadcast on frequencies adjacent to those used by radar altimeters that help aircraft land in poor weather.