I echo JetBlueFA's comments about the need to be EXTREMELY flexible and on your absolute BEST behavior. I'll also add that you should not opt to fly on a pass, unless you're willing and able to purchase a (very expensive) ticket at the last minute should you NEED to get to where you're going or return home ASAP. Also, keep in mind that there are numerous factors that come into play leading up to departure that may alter (both in or not in your favor) your odds of receiving a seat. With all that said, pass riding is an awesome privilege. Just make sure you're fully informed of the DOs and DON'Ts.