FWIW, Delta has been shifting flying back to mainline. Over Thanksgiving week, Delta departures are down 10.9 percent, but seats are only down 8.8 percent. That makes us the fastest shrinking domestic carrier by departures, but United is shrinking faster by absolute capacity.

It makes sense. If it takes 2 or 3 RJ's to feed a 757, the loss of a mainline jet has a proportionately higher toll on Regional carriers.