After weeks of chaos in U.S. airports , the Transportation Safety Administration said the first paychecks in weeks are being sent as early as Monday to its workers, giving the beleaguered aviation system a boost of optimism. Wait times at some TSA security bottlenecks, such as the airport checkpoints in Atlanta and Houston, improved significantly Monday morning. But how long it will take for long security lines to consistently return to normal — and how long federal immigration officers will