intention to provoke the accident on the return flight." on that return flight from barcelona to dusseldorf, this time, when lubitz goes to the control and takes it down to 100 feet, he executes that and the aircraft starts a controlled descent down to the ground. several minutes later, that deadly crash. the united states doesn't allow a pilot to be in the cockpit alone. in light of germanwings, the rest of the world is considering a similar policy. david? >> david kerley, who covers aviation for us. david, thank you. next, to a massive oil tanker train derailing, erupting into flames, forcing evacuations tonight. the thick, dark smoke seen for miles. hazmat crewing rushing to the scene. and with u.s. oil production now booming, there is growing fears that this could happen far more often. abc's clayton sandell tonight. >> reporter: huge plumes of smoke and fire erupting into the sky. the train, over 100 cars long, loaded with crude oil, derailing, then catching fire this morning. six cars engulfed. so much smoke, residents in the