The switch is not difficult to make. I was a ground contract through both of my PLC stints, and pretty much up to a few months before I commissioned. I know that PRK will med down you for like 6 months (at least that's what happened to a buddy of mine between OCS and TBS... non-air contract). As far as getting the switch, all you will need to do is take the ASTB, get a flight physical and submit a contract change. You are not obligated to take the oath, even after you complete OCS, so there is always time (however, I think there may be a limit on how long you can wait). Going for the combined PLC program will give you about a year to get everything settled before you get your degree and be looking to commission. Don't put it off for too long... I had mine hanging over my head for quite some time. Best thing you can do is knock out all the time consuming stuff as soon as possible (ASTB, flight phys) and hit up the paperwork when you have time, since most people are usually trumped for the air slot because they don't qualify due to the ASTB, phys. Talk to your OSO as soon as you can and he should be able to give you more concrete info.
