The fact that AA employs unlicensed individuals (called OSMs?) plus unlicensed skilled specialists like TWU Informer (welder?) at TULE and perhaps AFW means that AA permits unlicensed persons to help fix airplanes inhouse. Presumably, they're properly supervised so that their work results in an airworthy airplane (or at least their work does not result in an un-airworthy airplane).
Proper supervision is the key, whether the work is performed in Tulsa, Fort Worth, Timco, AAR or in El Salvador or China. Not everyone in the business of medicine holds an MD. For every doctor, there's an army of others who have contact with patients. Lawyers employ an army of paralegals and other support staff. Perhaps not everyone who touches an airplane needs to hold licenses. For example: adjusting/fixing seatbacks or changing cabin lightbulbs. Must one hold licenses in airframe and powerplant to competently fix those items?
There are certainly some well-publicized failures in outsourced and off-shore maintenance. The B6 plane that landed at LAX with the nose gear turned 90 degrees - wasn't that linked to faulty maintenance, maybe outsourced maintenance? The key is proper supervision and proper inspection.
If maintenance performed outside the confines of TULE or AFW or DWH was inherently shoddy and placed passengers at risk, wouldn't airplanes be falling out of the sky? After all, non-AA airplanes comprise more than 95% of the worldwide civilian fleet. And I'm not worried about maintenance issues when I fly JAL or CX or QF or BA or LAN or any other first-world airline. The single-727 African airlines are a different matter entirely. The sanctions-crippled Iranian civilian airlines would be on my no-fly list as well.
It's a delicate line to tread when arguing that maintenance performed by someone not employed by your employer or by someone in a different country is dangerous or places passengers at risk. Skeptics might conclude that the concern isn't necessarily safety-related, but is instead motivated by a desire to increase employment. Yesterday, someone mentioned the "foreign nationals" employed by AA in London who maintain AA planes. They're fellow employees who, because of their location, belong to a different union.
Years ago, Bob Owens and others posted about the growing list of maintenance checks performed by AA employees in other countries as if that's a bad thing. Owens has repeatedly posted over the years that AA pays the London mechanics significantly more money than the TWU employees are paid here. More evidence of how worthless the worthless union has become when non-TWU AA employee-mechanics are paid more to fix airplanes in London than TWU employees in NYC.