Unplanned events such as storms can really stir up airline operations. They can require flights to be canceled or rerouted. Aircraft, crews, and ground personnel are suddenly no longer available where they are needed. Every deviation from the schedule sets off an entire cascade of consequences. And the associated costs rise by the minute. The larger the airline, the more complex the situation. Delta Air Lines and Porsche Consulting have found a way to return from irregular to normal operations in the shortest possible time—with the help of cutting-edge technology and a playbook.