How did I find this?
I had accidentally selected the B-26(.plane 13) instead of the Panzer(.plane 23). Kept clicking H wondering why I was dying, then found myself spinning around under the landscape. When I realised my B-26 was zooming up over A1 without any wings or tail I was suprised.
When I tried the P-51D I was really suprised!
I tried all the other planes, but I cannot get the C-47, F4U, Fw 190, P-38 or Typhoon to work at all. Only the P-51D, N1K2-J and C.205 can consistently go to 100k. The La-5FN sometimes does too.
Once I launched a La-5FN and came up over A1 with only the gear and engine damaged. I then did a deadstick landing! Haven't been able to reproduce it on film though.
This solves the mystery of why A1 is up so high, they've got an ICBM base hidden under there!
