BE CAREFUL....and get a proper immigration attorney, NOT an immigration representative!
I worked in the US for ages under a work visa obtained from a rep which stated that I was a spray system specialist, as years past, I became DOM for the company. Dec 2007 I went to renew my visa, they called the company I was working for and the secretary inadvertently said I was DOM....long story short, what I thought was a technicality, ended up being barred for 5 years from re-entry into the US. Could not go back and pick up my tools, empty apartment...etc, a major life changer in short.
I now have a proper immigration attorney because I now need a waiver to re-enter the states, after my 5 years was up. I asked her about going to work as either a pilot or engineer and after a bit of research, she said there was no visas available under the NAFTA treaty for pilots or mechanics. Only ways are the intra-company thing or an, E2 investor visa which is good for 5 years renewable. E2 is where you would start a company in the US and invest money to start it....etc.
My advise is to NOT take it lightly because the consequences are pretty harsh. I've heard nightmares of people being barred who have been down there for years. The decision comes down to the customs agent at the border and how he feels that day, its not all that black and white(it reminds me of TC and CARS, its up to their interpretation!).
PM me if you would like my attorney's contact info.