Calm down, guys. I know sponsoring is necessary in every country. But of course, if you apply for a job position in the US, the company hiring you would be willing to sponsor you. The contrary is nonsense. "I want to hire your services BUT as you are from abroad I don't want to sponsor you".
I "talked" to somebody from US and my overall impression was that there's no chance to obtain an US work permit to fly helicopters even with sponsorship. Which is quite different from what happens in Spain, where you can work 100% provided you are sponsored by a company.
If I'm wrong please somebody tell me.