I made the mistake of taking a mission to Perry when I have a complete piece of junk for a space ship. Now it's hogging up one of my mission slots. Is there anyway to abort it?

It's not a cargo mission.

Nope. You can't abort mission. Use your previous save if you can.

After you'll land on station/planet make save and after taking mission make another one (do not overwrite previous).

You can cheat a lil bit. Turn invulnerability on in the menu and finish this mission with no payment.

But I'd rather buy 2 missle launchers with IFF or IR missles and spam enemies with lots of missles instead.
You would get paid and have fun together!