You can not just show up here and apply for citizenship because you want to. You have to be entitled under the laws to qualify for it. No us airline will sponsors pilots. Any who tells you that they are flying with pilots at major airlines that are foreigners are lying. People get hire at airlines here because they either get married to an American, apply for asylum, have parents who are US citizens, and their a few other ways, but these are the most common. If you anyone is upset about flying with foreign born pilot need to complain to your legislator. These are the laws and if you don’t like them then you can always leave and immigrate to another county.