I shot down BORG in his B-17 at 36k.
I got in my trusty P-38 which btw has a rated ceiling of 43k

it took most of my gas to get to borgs alt then i climbed a few thousand feet above. it took oh so many slashing passes to kill him but he did go down in flames and it was quite satisfying to watch his debri float 6.81 statute miles down

I ran out of gas 30 seconds after he went down in flames and coasted in and landed

fyi: it takes p-38 about 18 minutes to get to 36k. with a 5k airstart it takes 16.5min for p38 to get to 36k it takes a buff over an hour to get that high even with a 5k airstart.
so you can get up to that buff and climb well above him but if you crawl up his 6 you will die fast anyways so slashing attacks from above can be conducted with impunity although aiming is hard at such very high true airspeeds
[This message has been edited by Citabria (edited 10-12-2000).]