Confused, could have become distracted, and it could have caused a crash. >> reporter: and prosecutors say it was all about money. according to court documents, alani told investigators he was upset over a contract dispute between the mechanics union and the airlines. he allegedly claimed the dispute had cost him money. according to the criminal complaint, quote, alani claimed that he tampered with the target aircraft in order to cause a delay or have the flight canceled in anticipation of obtaining overtime work. a key question tonight -- are mek ans like alani monitored well enough to make s...