You’re going to have to elaborate on what standardizing (and otherwise making more efficient and safe) air travel in Canada, Mexico, and the United States has to do with cheap labor . . . the cheap labor is walking or swimming across the border . . . not flying business class.
The article wouldn’t have listed it as “controversial” if it were simply a great idea for standardization...safety and efficiency...now would they?
Cheap labor and air traffic control have nothing to do with each other in this context ...they both have everything to do with the context of the NAU...