jetblue BOS domicile
You'll get based wherever you can hold when you're in class. It will be either BOS or JFK. Boston is easy to hold. Upgrade has gone fairly junior in the last two awards for 190 FO. About 3 years or so. Yes, the company pays for parking in the Chelsea garage, $40 per month at your commute city, or a bus/T pass.
The other stuff you'll learn about if you're here, and it changes anyway.