As far as I know, Canadians are not allowed to work as pilots in US without green card.
You may want to check the following thread:
Foreign pilots now allowed to apply for a Green Card?
especially the following quote:
Originally Posted by
Ana_stasiia
Quick update on our pplication for NIW Eb-2. Don't waste thousands of $$ on lawyers. We applied on our own on Oct 08 2021, and on Feb 23 2022 our I-140 was successfully approved. I know it's not a final step yet, cause it has to go to Consular Processing, but it means that this NIW stream for pilots is working. My partner who is a petitioner has 10,000 hrs, Bachelor's Degree and French military ATC license, and currently employed with Canadian airline as a SIC. P.S. He did not do any conversion. I prepared the package by myself, so if you decide to go the same way we did, read well the cases of people who applied (can be scientists, professors) to see how the package should look like and how to fill all the forms. We had only 2 recommendation letters, but I would put 4-5. Good luck to everyone!!!