anti aliasing

Every now and then I like to switch to 'spot plane' view just to see how damn handsome I look when I'm flying along (don't we all?). 
I get a little put out at the jaggy outline of the plane, so I tick the 'anti-alias' box in the settings pages which I assume is meant to get rid of said jaggy effect and hey-presto the panel disappears when I'm back in the plane. :o
Anyone know why that is, or have any fixes?
Thanks :)

I get a little put out at the jaggy outline of the plane, so I tick the 'anti-alias' box in the settings pages which I assume is meant to get rid of said jaggy effect and hey-presto the panel disappears when I'm back in the plane. :o
Anyone know why that is, or have any fixes?
Thanks :)