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

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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”.