While it's not a true "fly by lane," the Las Vegas "express line" for BS/F pax at the big checkpoint was totally worthless last Friday. The TSA was sending families with several strollers and young kids (who the hell brings their babies and crumb crunchers to LAS anyway?) in that line.

One other warning about that line at LAS, do not go into the glass chute to the left. That takes you into the MMW machine. The TSA ID checker tries to force you into that lane if the WTMD lines are long.