At over 80 percent systemwide, it's considered that nearly every flight is full.
Here is what the airlines have learned in this worst year ever for customer service: We're treating them like cattle and we're making more money at it! [Of course, cattle get fed and there are laws governing humane transport of cattle]
You ain't seen nothin' yet.
By the way, Kate Hanni's Coalition for Airline Passengers' Bill of Rights now has 21,000 active members. And they all take notes.