Hey Ive realised that on the external model it seems like there are a couple of lines. 2 of which travel down length of plane. These lines basically appear like bad aliasing. Perfect when up close. But when zoomed out look like not to good. Any else have this problem. No other plane has it.

Ok well I fixed this issue by changing the settings on NVIDIA panel now planes external looks beautiful seya ;D

It's the bump map of the jet.You can elect to mip map the file, so you don't have to apply more AA filters to it.