Hi Otto,

Im not sure if this is any help to you - it might just be a freak effect with my cfs2- but ive noticed that when i'm flying one of my cfs2 jets at around 17 thousand ft i get an interesting faint "boom" when my plane passes through the sound barrier - but no external effects. 

As you know, CFS2 has no default sound files for jet aircrfat, so ive had to use a compatable jet-sound from FS2000, maybe this is what is causing the explosion. [?]

As for an actual effect, i'd be really interested to know if anyone out there has a sonic boom for cfs2 - but i dont think there is one yet.

Ed