Here's the scoop on AOCS vs. OCS (as well as some info on flight training):
Until about ten years ago, there were two Officer Candidate Schools; regular OCS (for Surface Warfare, Intel, Supply, etc) in Newport, RI, and Aviation Officer Candidate School, or AOCS (for pilots and NFOs) in Pensacola, FL. The training was quite a bit different, largely due to the different roles the graduates would play once they got to the fleet, with AOCS focusing on aviation-related training and regular OCS focusing on ship stuff. Well, in the mid-90's the Navy decided to combine the two in an effort to save money. OCS in Newport was closed and moved to Pensacola to combine with AOCS, and it was decided that ALL naval officers needed to have a basic understanding of nautical subjects, so the training curriculum put in place was basically that of the Newport OCS. All the aviation-related subjects were pulled out of accessions training and a separate, 6-week long ground school called Aviation Preflight Indoctrination (API) was instituted for aviation types to attend immediately after commissioning, prior to beginning actual flight training. So here's how it breaks down now: if you are designated for aviation and attend OCS, you should commission in 12 weeks (it used to be 13, but it was shortened to 12 about 3 or 4 years ago in yet another effort to save money). Next stop is API which is 6 weeks of actual training, although there is usually a large pool of students waiting to class up so you may wait for months before actually starting. After successfully completing API you will go to your primary training squadron, which (for pilots) will be either in Corpus Christi, TX (NAS Corpus Christi), Milton, FL (NAS Whiting Field), or you could do flight training with the Air Farce as part of the whole "joint military" concept; their school is in Enid, OK (Vance AFB). NFOs stay at NAS Pensacola. Time from commissioning, hold pool prior to API, actual API training, assignment to Primary and actual completion of Primary Flight Training varies quite a bit, but you can expect something around 12 months. After primary your destination & time to completion will vary depending on what community you get (jets, helos, P-3s, etc).