US airlines face potential delays and cancellations due to 5G deadline

Starting July 1st, US planes without retrofitted sensitive radar altimeters won't be allowed to land in low visibility due to potential interference from increased 5G network power. About 80% of domestic aircraft have undergone the upgrade, but some top carriers still need to finish their fleet. The Airlines for America trade association blames supply chain problems for the delay. There is a risk of delays or cancellations, but the level of impact will depend mainly on the weather. All planes in the US will need an updated altimeter by February 2024, regardless of visibility conditions.