Just read a story today in the Seattle Times about SEA, and how much busier it is than ever expected. One of the most interesting items in the article was this quote:
"Additionally, the airline meets with TSA every day to talk about passenger projections, and TSA tells the airline which checkpoints will have the most staffing, meaning faster processing for travelers.

“It is just communication, communication with all the airlines, not just Alaska,” Ladner said. “We are the biggest here, so where our customers go can really slam on their lines.”"

I am not sure it really helps that much as I have not noticed the lines getting less long or moving that much faster. (although those of us that have precheck do get through much quicker than those that do not). Bottom line though, it would seem that airlines should be talking with TSA to let them know anticipated loads and times.