the pilots from taking off at the last moment. takeoff was aborted. and now one man is in court today accused of trying to sabotage that flight. cnn aviation correspondent renee marsh is joining me now with details. renee, this is really scary, these details comie ining out. what happened here? >> reporter: when you think about it, this plane was rolling down the runway. you had 150 passengers on board. what this mechanic did was allegedly placed foam in a tube that leads to a flight navigation system. luckily we know these airline pilots recognized that something was wrong. they received an alert and aborted takeoff. but the person behind this, this mechanic, he told investigators the reason why he did this was he was upset over a contract dispute between the union