Bukkit

What steps will reproduce the problem?
1. Fly an aircraft
2. Point at direction at an X by X tower of any block and repetitively left mouse click to fly in that direction.
3. After spasms of mouse clicking, the aircraft will be on the other side of the block

What is the expected output? What do you see instead?
Expected output: The X by X tower should be blocking the craft from moving any furthur however the craft basically warps thru.

What version of the product are you using?
v 8.1

Do you have an error log of what happened?
Not currently, I suppose I could investigate the issue more if needed.

Please provide any additional information below.
Read above.