US warns of potential 5G delays for airplanes without updated altimeters

U.S. Transportation Secretary Pete Buttigieg warned Friday of potential delays starting July 1 for airplanes that have not yet had radio altimeters updated to address potential 5G C-Band interference and urged them to adjust schedules if needed.

While more than 80% of the domestic fleet serving U.S. airports has been updated, Buttigieg wrote "we continue to see a significant number of aircraft still awaiting retrofit, including many operated by foreign air carriers. This means on bad-weather, low-visibility days in particular, there could be increased delays and cancellations."

He urged airlines who will be flying without the updated equipment "to act now to adjust your schedules proactively".