Initial rollout of the federal government's Secure Flight program is causing confusion among even the most seasoned passengers, the Sacramento Bee reports. Not all airlines are currently collecting the additional information required by Secure Flight, and some of the big online booking sites are following the airlines' lead. "It is causing confusion and angst among business travelers who are core travelers who generally know the ropes and don't have angst," says business travel writer Joe Brancatelli. But a TSA spokeswoman says travelers don't have to worry about missing their flights while the new requirements are phased in over several months. "There is definite flexibility right now at the checkpoints," she tells the newspaper. "Some of that flexibility will go away in 2010."