Reserve owes 18 days a month to the company. As an FO, good luck trading days much. The good news is other than PDX and ANC, you will get what you want quickly, or get off reserve entirely. Next comes secondary lines, the leftover trips that everyone else threw back in the recycle bin. They are mostly garbage. Primary lines give you the most trading potential and flexibility, and even being junior I usually get pretty close to what I want. However, if you haven't started class yet, we will probably have moved to PBS by the time you get a line, and it will all have changed.