Faa chose 50 airports based on location, traffic volume, and the likelihood of low visibility. All factors that may increase cancellationations, delays, and diversions as both carriers roll out 5G C-band service.

Chicago O’Hare, Orlando International, Los Angeles International, and Dallas / Fort Worth International are included on the list. The Wall Street Journal says the list includes airports in locations that are often impacted by foggy conditions.

At & T and Verizon have agreed to turn off their 5G transmitters at these specific buffer zones for six months. Some airports did n’t make the list, either because they are n’t in locations where 5G C-band deployment will take place, or they ca n’t allow low-visibility landings.

At & T-Mobile already offers 5G service, but it is n’t in the C-band range range. The two currently offer 5G service using super fast high-band millimeter wave technology that only covers small areas. The low-band spectrum provides a lot of coverage with slow service akin to 4G LTE.