The disturbing truth about how airplanes are maintained today!
In the last decade most of the big U.S. airlines have shifted major maintenance work to places like El Savador, Mexico, and China, where few mechanics are F.A.A. certified and inspection have no teeth.
Interesting article in the Vanityfair magazine in the link below.
The Disturbing Truth About How Airplanes Are Maintained Today | Vanity Fair