ATLANTA (AP) — Fast moving airport security lines at the start of the Memorial Day weekend could bode well for return travelers Monday. Travelers reported moving quickly through airport checkpoints Friday after authorities opened extra screening lanes and used bomb-sniffing dogs to give some passengers a break from removing their shoes. [...] as the busy summer travel season kicked off, the federal Transportation Security Administration tried to offer travelers some relief after weeks of slow-moving lines blamed on an increase in the number of air travelers and a shortage of TSA security officers. At Hartsfield-Jackson Airport in Atlanta, known as the world's busiest, all 16 security lanes at the main checkpoint were open Friday morning as a bomb-sniffing dog and its handler walked among waiting passengers. The dogs "have the ability to screen large groups of passengers for explosives, making the removal of shoes and laptops and such unnecessary," TSA spokesman Mike England said. Typical security procedures appeared to be in place, with passengers removing belts and shoes and taking computers from bags and items out of pockets. Passing through the millimeter-wave scanner, she was stopped and asked to empty her pocket for what turned out to be a tiny piece of foil from a gum wrapper.