Don’t you know?
google:
“airlines outsourcing maintenance?”
Here is one for you: On a recent trip leaving from Toronto, two airline maintenance men came off the tarmac from a van they were driving, got into the passenger tunnel, came up into the terminal, and chatted with a friend they knew, (and knew where in the airport he was at). There was no plane at that terminal. Then after a time, they went back down to their van and left. How is that for security?