Well just don't try going to Hawaii on them or any other popular destination and you should be fine.
Here are some of the rules the rest are on the coupons.
You fly standby and are at the bottom of the standby list below any revenue passengers and below any employees.
You will get the worst seats on the plane back of cabin and generally a middle seat.
If meals are served on your flight you have to call in ahead for them. Your friend will get charged a tax on the tickets.
Try taking the first flight out of the day.
I wish you well,I have flown on them several years ago and for me I would never try it again but hey if you have the time and patients go for it.