The F.A.A. says it has reached a deal over 5G service at airports.

The FAA said on Friday that it had reached an agreement with AT&T and Verizon on a way to expand 5G cellular service while allowing more aircraft to safely land at airports nationwide.

The F.A.A. and airlines were concerned that a nationwide 5G expansion would endanger flight safety. The new generation of 5G service uses the C-band frequencies, which are close to the portion of the spectrum used by safety devices.

The compromise was reached a day before the expansion was to take place, but would not include 5G within two miles of some airport runways. On Friday, the F.A.A.'s announcement suggested that all sides were moving in the right direction.

The F.A.A. appreciated the strong communication and the collaboration from the wireless companies, which it said had aided in a deeper analysis of the location of the transmitters.

This data was used by the F.A.A. to map the size and shape of the areas around airports where 5G signals are mitigated.

The F.A.A.'s statement was not commented on by the two companies.

The wireless industry, aviation industry, F.A.A. and F.C.C. are making progress according to the chief communications officer at CTIA.

Airlines for America, an aviation trade group that represents the nation's largest air carriers, welcomed the development.

Billions of dollars have been spent by wireless providers for the right to use the next-generation network. The roll out was delayed multiple times due to concerns from the aviation industry.

The F.A.A. was concerned that 5G could interfere with the readings from radio altimeters. When visibility is low, it's important for pilots to know the measurement used in other critical systems.

Last week, President Biden praised AT&T and Verizon for agreeing to delay deployment near major airports, and said that the compromise would still allow more than 90 percent of the planned service expansion to proceed. 90 percent of the U.S. fleet of commercial airplanes have been cleared by the F.A.A. to land where the new generation of 5G is being deployed.

David was involved in reporting.