The FCC announced 30 June 2026 it will vote 22 July 2026 to auction 160 MHz of Upper C-Band spectrum (3.98–4.14 GHz), with the auction set for 2027. Simultaneously, the FAA confirmed radio altimeters can safely coexist with new 5G signals from this auction. Congress mandated at least 100 MHz auctioned by July 2027; the FCC exceeds this by auctioning 160 MHz to create a contiguous 440 MHz super-band combining Lower and Upper C-Band. This resolves long-standing aviation safety concerns regarding 5G interference with radio altimeters. The FAA’s confidence, based on years of testing, allows 5G expansion without disrupting critical aviation safety systems. New rules limit 5G signal power to FAA-safe levels and protect the altimeter band (4.2–4.4 GHz). Winning bidders must cover transition costs and provide rebates for upgrading aviation radio altimeters. Airlines receive financial support to retrofit or replace older radio altimeters. Wireless providers gain prime mid-band capacity, accelerating 5G rollout. The auction is expected to raise tens of billions of dollars.