The staff in Atlanta needs to learn how to use the Breezeway.
For my last flight, they called Zone 1 and half the people went in the Breezeway because they regular line was "too long" and she actually stopped the Zone 1 line and let those other people in first. She did the same thing for Zone 2!!
Someone needs to explain to the GA's that the "Breezeway" only opens up after Zone 3 has boarded.