facing trial in april accused of paying for sex with a minor. in a moment, cnn's exclusive interview with silvio berlusconi's accused madame. and welcome, glad you're with us on this wednesday, february 16th. welcome to "american morning." i'm kiran chetry. >> i'm t.j. holmes. right now, thousands of passengers could have their travel plans disrupted today after united airlines grounded its entire fleet of boeing 757s. why? they're going to have to perform emergency maintenance on computer systems of 96 plaines. allan chernoff here with the story today. explain the problem first of all. >> well, these are 757s, the entire fleet. and the computers on the planes that actually track the speed of the altitude and feed that