Two American airlines have now told the Securities and Exchange Commission that weather is costing them money. Not a risk-factor note. A figure for shareholders.

The bill: American booked "an estimated $320 million revenue impact from winter storms" in a single quarter, after the largest weather-related disruption in its history. JetBlue told the SEC that severe airport-weather days across the National Airspace System rose more than 40% against the prior three-summer average. (American 8-K, 2026-04-23 | JetBlue 8-K, 2026-09-10)

The ground: Brookings mapped 145 US hub airports. Twenty-four flood at one foot of sea level rise, eleven of them losing runway. Their own conclusion: "We simply know too little about the range of needs and costs in the airport adaptation space." (Brookings Metro, 2023-03-01)

The price: SFO's shoreline defence went from $58 million sized for 11 inches of sea level rise to $587.1 million sized for 36, and $1.5 billion once the borrowing is paid. In Alaska, runways sinking into thawing permafrost run $3.4 billion by midcentury against $220 million on a Paris-aligned path. (San Francisco Examiner, 2019-09-11 | Alaska Beacon, 2023-02-16)

TLDR: Airlines can tell you what weather cost them last quarter. Nobody can tell you what it costs to keep the runways above water, or out of the thawing ground, or the planes flying through unprecedented skies.