A massive winter storm is barreling into the heart of America this weekend, and the nation’s airlines are already sounding the alarm. Delta Air Lines alone has yanked two-thirds of its Dallas–Fort Worth departures on Saturday and slashed hundreds more across the Ohio and Tennessee Valleys. Travelers: reschedule now or face outright cancellation.

Delta has canceled flights at five major hubs and warned that slow de-icing operations will trigger more groundings. Nashville and Raleigh–Durham will bear the brunt of the chaos as ice, sleet and ferocious winds sweep the South and Midwest.

American Airlines is scrambling to add 3,200 extra seats in and out of Dallas–Fort Worth from Friday through Sunday—an admission that even the nation’s largest carriers are unprepared for this onslaught.

The National Weather Service predicts a brutal mix of freezing rain and snow will knock out power lines, down trees and render roadways impassable across the Southeast. As the storm thrusts north, airports from Atlanta to Chicago will face deep freezes and runway blackouts.

This is one of the busiest winter travel weekends of the year. Airlines have no margin for error. If your itinerary passes through the Ohio or Tennessee Valleys, or any Southern hub, cancel it now and avoid the scramble.

Use airline apps for real-time updates. Web portals will be overwhelmed. Agents will be flooded. Your best shot at a seat is to rebook yourself immediately.

Don’t rely on government rescue. If you’re not flexible, stay on the ground. This storm leaves no room for last-minute fixes.

The next 48 hours will define airline resilience under extreme weather. Plan accordingly—or get left behind.