This latest iteration of what I assume is a Connect Airlines ad may shed a little light on the Canadian issue (or for now at least). Can E3 visas be far behind ?:
“You must have the right to work and live in the USA. If you have applied for your USA Green Card, you can go ahead and apply now! If you want to apply for your Green Card to apply for the job, please hit APPLY NOW!”
https://jobs.flightglobal.com/job/14...ob-description