This article and others plainly state that he worked for Alaska and American Airlines simultaneously. Neither airline had rules forbidding this. American would be unaware of the Alaska termination if he is already an American employ and have no reason to do another background check.
Also background checks as a rule do not usually uncover a direct reason for termination. Employers fear legal repercussions if they disclose specific information, so if asked the question whether they would rehire, you usually get a yes or no answer only.

WOW... No respect for a Mechanic like that... Hope they throw the book at him... Makes all us Mechanics look bad...

It is highly likely that his screw-ups at Alaska were not mistakes or accidents. All the "errors" involved important flight systems. Fortunately, he was too incompetent to do it effectively given 29 years of opportunity to do so. The clocking in on two jobs at the same time is a good indicator of his integrity.

I agree with Peter. When will we learn?

....then he uses discrimination as his defense! Shows the type of person he really is.

It's a scary world in which we live. We had two Iranian flight students in my Air Force flight school back in 1967. We were training Iranian pilots. Lots has changed since then.

We've had many shootings and bombings from supposed Americans. Some had ties to the Mid East and some did not. I'm not passing judgement but when I hear a person's name of 5 words in a spelling I don't understand, I get cautious. I wonder what nick name this mechanic went by. I surely would not address him by his full name. To me, his name sounds Saudi but I don't know.

Interesting. I wonder what happened to the other planes he worked on? The ones that maybe someone didn't catch his "error"?

Just his name alone would lead me to very cautious in considering him for employment.

It seems to me that these events would have been significant enough than it would have been circulated throughout the industry. I don't understand why American didn't act on this and release him as well.

Failure to do a background check

You only have to notice his name and place of birth.

good grief! american used to be very selective in who they hired for any position, and mechanics were monitored by supervisors and sometimes people who would travel to various bases for maintenance and double check ...its odd how this person slipped through the cracks and was hired..surely at the time they were not that hard up for trained people..i knew of one mechanic at aa who was fired,but not for his work..it was for his lack of work as he slept a a lot on the job and was caught sneaking out on the clock to visit his girlfriend!!!

Whomever hired him should be fired for not doing a proper background check!

Just his should tell you something.