Once you make it to the States, you will absolutely care about what carrier you fly for. There are differences in contracts so one is not the same as the other BUT compared to foreign carriers the difference between U.S. carriers is less.

I wish you luck and success and it sounds like you have the determination to do what it takes to get here, but just keep in mind that once you do you will start to realize the differences between the airlines in the U.S. and that will start to become important to you.