Here are the facts regarding employment of non citizens in the US of A. 1. To be employed you must be a resident alien i.e. "Green Card" or win the immigration lottery that is drawn every year. To get those, you must marry someone (hopefully a nice person)or be sponsored by a close family member. 2. The only sponsorship available is from flight schools so that you may get experience as an instructor etc but this is usually only for a year. 3. Airlines are not sponsoring anyone since there are enough pilots and they government wouldn't let them anyway. The hi tech companies are fighting hard at this moment to import labor since they claim a lack of talent. So far the government has not approved.
At our airline, we have people from all over the world but they have residency cards when they apply.