"Over 10,000 flights into and around the US were canceled through Tuesday. Most of them originated or terminated in New York, Boston and Philadelphia." This is a massive disruption to the national aviation network. The Northeast corridor is the most profitable region for legacy carriers. 10,000 cancellations will result in material revenue hits and increased compensation costs for Q1 earnings, specifically hurting carriers with major hubs in these cities (United at Newark, Delta at JFK/LGA, American at Philadelphia). SHORT airline equities exposed to the Northeast corridor. Airlines may have weather waivers in place that mitigate some passenger compensation costs, or the market may view this as a "one-off" event.