My vote goes to ATL "T" Terminal. 3 x-ray machines, 2 of which are always open and 2 lines with 2 BP checkers...but, tons of employees cutting the line, the line can get so long that it has to cross a main circulation aisle. But the worst part is that there is very little table space before the machines, and at least for one of them, the tables don't run all the way up to the machines, so you have to carry your stuff from table to machine...and if you have a few bags/bins, it holds things up.