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How much will C-Band upgrades cost the airline industry?

According to the International Air Transport Association, it’ll cost around $637.6 million to replace altimeters that don’t properly filter out C-Band 5G. That’s quite a bit more than the FAA’s $26 million estimate from January, though as Fierce Wireless points out the IATA probably “has an axe to grind” about the whole saga — it didn’t want carriers to get C-band from the start.