I have to agree with jrmyl, he's absolutely right! Without having the legal right to live and work in the US (green-card or citizenship) no airline or commercial operator will hire you. There are opportunities to work as an instructor for a limited time (depending on the time left on your visa after completion of your training) but there are only a few flight schools in the US which are eligible to offer this special type of visa. Only Part 141 schools can offer the visa and not all of them do. And one must have done the training with the respective flight school. I'd suggest to do some thorough investigation (not only here on the forum) before taking the plunge.