robert kaluza was tried on a single misdemeanor charge of pollution. prosecutors said that he and another rig supervisor botched a negative pressure test and missed clear signals of trouble before the explosion on the deepwater horizon rig. >>> a very different verdict has been handed down by investigators in the case of a us airways jet crash as it tried to take off two years ago in philadelphia. >> at the time, the airline suggested it was a blown tire but now investigators are blaming pilot error. here's abc's david kerley. >> oh, my god, my plane. my plane just crashed. >> reporter: it was a scramble. >> the plane is on fire. >> reporter: for the 154 people to get off the jet. >> i see smoke down there. we're going to dispatch the emergency vehicles. >> reporter: this, after the four-second flight ended by slamming onto the pavement in march of 2014. first reports of a blown tire or landing gear trouble were wrong. it was pilot error. according to the ntsb, the pilots didn't input a piece of information into the flight computer. so, as the jet star