. >> police chief shawn wendt says that one of the guns found today is linked to a double murder. >> there is heightened security at bay area airports. this is transcending to longer lines. we're joined with leigh anne with what people can expects. >> reporter: this is right about the time when sfo starts getting busy again. it was very busy this morning. so when you arrive, you may get hit with a double whammy. of course, more security. and very busy terminals. so get here early. >> some flights along the west coast were delayed because of this morning's rain. that added to the two wig challenges travelers faced. more security and a very busy holiday period. >> i'm here a little bit early, but i just don't like being stressed out. >> as we look at our holiday travel bookings, they're about 7 1/2% higher than last year at this time. it looks like people are still booking with comforts. >> pass engers are seeing more patrolling after the state department issued a worldwide travel alert. >> a continuation of what we've been seeing already. which is a heightened individual lens, awarene