AC

If you're flying out of Boston's Logan International Airport, you may meet Carla. She's got tips for getting through security, a warm personality, and she speaks two languages. But don't ask her any questions. Carla is a video-projected "virtual assistant" who helps passengers at the main security checkpoint in Logan's international terminal know what to take off and toss out before being screened. "She doesn't replace any staff," says Ed Freni, director of aviation for the Massachusetts Port Authority, or Massport. "We just want to have a more effective way to communicate with our customers. … She's an attention-grabber and is much more effective than some of the signs and some of the videos we have." Boston isn't the only airport to turn to virtual help. Washington Dulles has "Paige," a hologram that made its debut last month to greet and guide arriving international passengers in a summer-long pilot project. New York's three major airports will get their own avatars in July....