WASHINGTON, D.C. – Senator Maria Cantwell (D-Wash.), Ranking Member of the Senate Committee on Commerce, Science, and Transportation, criticized Senate Republicans’ spectrum auction language released on Thursday, June 5, 2025 for failing to protect aviation safety and national security. The proposal would require the FCC to sell off at least 100 Mhz of spectrum in the upper C-Band, directly adjacent to the spectrum used for aircraft altimeters, within just two years. When the first Trump administration auctioned the lower C-Band—even further from aircraft altimeter spectrum—the FAA was so concerned about potential interference it nearly grounded every airplane in the country in early 2022.

“At a moment when maintaining safe skies has never been more challenging, this proposal recklessly endangers national security and aviation safety by mandating spectrum auctions in the C-Band before new altimeter standards are even finalized, while providing zero resources to an already capacity-constrained FAA or to update vulnerable altimeters on DOD and government aircraft," said Sen. Cantwell. "By rushing to sell off spectrum and failing to fund these essential safety upgrades, we're setting ourselves up for a catastrophic repeat of the 5G C-band debacle—except this time we risk grounding the armed forces as well.”