If you goal is to get to United, as soon as you can, then go to a 4 year school that is accredited by the FAA to meet the "restricted ATP" minimums. There are ten on the list so far. UND, Embry Riddle, Western Michigan, Auburn..... Those schools allow you to get the ATP with 1000 hours TT. All major airlines prefer a 4 year degree. Delta requires it. You can fly while in school. Then work for SkyWest to get at least 1000 PIC turbine time to become marketable. By the time you get done with college. All regionals will be begging you to work for them if not paying for it. Half of all major airline seniority lists will retire in the next ten years.