You can't "drop" trips at SWA, you can only post them in "giveaway" and hope that someone else picks them up.

The only "drop" option is military or call in sick.

However, you can giveaway all you want as long as someone will take it.

We can also trip-trade with the company (ELITT-Electronic line improvement trip trade), but you can only trade trips of approx same # of days.

You're always free to work as much as you're legal for. 30/7 is usually the rule that is most restrictive to adding to your schedule.