Along with the foreign maintenance...
What about outsourcing the 3rd shift ramper work that involved cleaning the planes overnight? If past experience at DFW with the food vendors is any indicator, it won't be long before the INS conducts an illegal alien sweep of the cleaners and carries off about half the overnight contract crew.
The food vendor workers are supposed to be cleared because they work inside secure areas of the airport. The last time the INS went through DFW food courts, several of the vendors had to shut down because they didn't have any workers left.
My guess is that the outside cleaning contractors will pull an innocent face and state that they did the security check, but the worker must have been using someone else's id. And, they will be shocked (shocked! I tell you) that they had illegal aliens on their payroll.
😉