Unless they change the Immigration Laws, which I doubt!, you cannot work in the US without a Green Card. The exception to this is if some company (airline?) hires you because they cannot get suitable people over here! They can get work authorization, visa's, etc. for you.
I don't think thats' very likely, however! It can get very expensive for the company, and there are too many aviation applicants, at all levels, over here already.
Sorry to be a wet blanket, but thats the way it is!