With the furore over long airport security lines growing, Delta Air Lines debuted a new system Wednesday it hopes will help solve the problem. "The biggest constraint of the system is the X-ray screening of the bags," Delta COO Gil West said. In an effort to speed up the lines, Delta is doing a 3-week test run at Atlanta's airport that changes the way passengers move through security. "Day one it increased productivity 30%," West said. He's expecting productivity to double before the test run ends. In the current system one slow traveller can back up the line because everything happens in series, and in Delta's innovation, everything happens in parallel. Instead of travellers putting their things on the conveyer belt one at a time, there are 5 stations, so there are 5 different people going through their pockets and getting their bags X-rayed. <br/>