it's owned by a company called st aerospace. >> according to statistics i've seen, st is the largest of all of the mros, the outsource facilities, worldwide. this is a singapore-based company that has opened maintenance facilities in the united states. >> o'brien: since 2002, st has been doing a lot of maintenance here in mobile for major airlines like united, delta and u.s. airways, carriers that used to do almost all of their maintenance in-house. st would not allow us to visit or grant an interview, but we talked to many st workers, from line mechanics to supervisors. here at papa buddha's, a bar in mobile, we heard a lot about long hours, hard working conditions, and the pressure mechanics were under to "move the planes." a few agreed to talk, but only if we would protect their identities. >> to be honest, if you have one inspector... >> o'brien: one-- we'll call him "john"-- worked at a major airline for many years before joining st. what were your marching orders when you were inside st? >> it was typically "push." i mean, you know, you were given x amount of time to accomplish