actually the VISA that was issued to me was for a total of 5 years...
Yes you are right, you would be in the US for 3 years at aviator in their college program. 2 years of study, where you will be working as a flight instructor getting paid for the last 2 semesters and then your OPT will start for one more year.
Now remember you might need to leave the country for your OPT and apply then come back when it is done. It might take up to 3 months for your OPT to be approved.