TTN

Smoke from over 900 Canadian wildfires delayed more than 10,700 flights in the US on July 17, 2026. Critical air quality advisories affect 17 airports and expose 100 million Americans to hazardous pollution.

More than 10,700 US flights were delayed on July 17, 2026, due to smoke from over 900 Canadian wildfires impacting air quality across 18 states. Airlines United, Delta, and American issued travel advisories and waivers for affected flights within specific deadlines.

United Airlines canceled more than 2,000 flights nationwide on July 20, 2026, due to a technology outage. Ground stops were also implemented, causing widespread delays.