Dont take this the wrong way, but It is simply not possible to do two degree programs at Purdue when you are a freshmen. I know people who couldnt get past first year engineering, let alone flight training and all the other classes. Of course you will have NO life if you attempt this, and at Purdue if you try this, you will burn out very quickly. Purdue is a great school with a far superior social atmosphere than Riddle (we actually have girls!) but it is much harder.
Purdue's engineering program is in a different leagues than ERAU's. It is a world class engineering school. But, if you want to get out of it you have to work your ass of. It is very challenging.