Agreed; there are currently no North American sponsorship programs that I am aware of. As mentioned, there are carriers who have cadet programs (e.g., Cathay Pacific). A google search for airline cadet programs will provide you links to those airlines with such programs, and what you'll need to apply.
There are also flight path programs, where an airline either agrees to interview or hire the top students from designated universities, but these are not sponsorships or scholarships - just an agreement between the school and the airline. It behoves you to excel in your studies when these programs are available as it is often your final marks which determine eligibility. However, you're still responsible for the upfront education costs with no guarantee of a position after graduation.
Financially, there is the possibility of obtaining a scholarship through a university to assist with part of or all of the typical university expenses, but these will depend upon your scholastic record, community service experience, et cetera. Any scholarship will be university or program dependent, so you'd have to contact the school directly to ascertain what scholarships are available. Sometimes, scholarships are only available to current students with an excellent record, so you end up in a situation of spending money to "make" money.
To conclude, I would agree with bizjetway's suggestion to your situation. Get a job that permits you to save what you need for a couple years, then go to school. You have near 40 years in your career if you start now. That's a long time doing the same thing every day. You'll enjoy and appreciate it more with some life experience behind you.