After review everything, both what you said and what we have in our logs. I`ve come to this conclusion:
You weren`t banned 5-6 months ago, it was more like 18 months ago (a year and a half) - exact date 12/3/2014 (December 3rd 2014). I doubt the reason you wish to play here again are honest and true. I conclude from you waiting the upper amount of time to make an appeal. Plus, your explanation is very vague. It wasn`t a one-time-only incident. You were kicked once for trolling as a pilot. Then decide to come back and go on a teamkilling spree. Other players have also told us that you`ve done that before.
Your behaviour back then has not been and will never be tolerated on our servers. The AhoyWorld train has already drove off for you.