You cant apply for a work visa without an employer sponsoring you to work in the United States
In the U.S an employer has to prove that there is no qualified and able american citizen or permanent resident for a pilot position and only then can they hire a foreign citizen
Needles to say there are thousands of pilots in the U.S and all the employers require you to have the rights to work in the U.S before they even interview you
So working in the U.S is out of the question for you my friend
I know this very well because i learnt to fly in the U.S
All foreign pilots who learn to fly in the U.S go back to their country of origin once they finish their training
The U.S govt will not allow airlines or flying schools or any other companies to hire a foreigner as a pilot as there is no shortage of pilots in the U.S