No, it doesn't matter what your background is when you pick from what is available. The course is designed to give you knowledge and experience that will help you pass Eagle's ground school and SIM. On the first day of training you will be assigned seniority based on age in your class (oldest to youngest). Then the list of equipment matching the amount of people in your class will be posted on the board and the fun begins.... Bidding based on seniority. I know of people who had over 1,000 hrs on the mighty CRJ and got the ATR while someone with 1,000 hrs on the Dash got the ERJ. Todays class can have 40 RJs and no ATR and the next class can have most ATRs. Bases and equipment will vary as age where the equipment will go (ATR mostly goes junior) A 22 year old can get the CRJ on one class and on the next it might take being 30 to hold an RJ... It all depends on what is available, and what the demographics of your class are.