He flew at that 36K for 42 Minutes. It took me that long to reach him.
Here are the AH climb profiles for the B-17 in two configuration: 12x500lbs with 50% and 100% fuel:
The lighter configuration can reach it's absolute ceiling (~35.7k) in about 70minutes, but has run out of fuel. The only way to reach that point earlier or get a tad higher even would be by dropping the bombs early. The 100ft/min service ceiling (~35k) can be reached in about 50 minutes
The heavier configuration will eventually meet the same limit, but it will take much much longer. I'd guess somewhere in the 90-100 minute range to get to about 35k.
That's why the '36k' is a freak exception in the MA. And that's probably why I don't remember encountering any B-17 above 34k above the strats ever (and I have killed literally hundreds of 30k+ strat raiders). A few times I took my fighter to intercept 17s reported to be at 37k+, but film viewer showed they always had been lower (that kind of reports happen easily, as in AH at high altitudes even co-alt cons appear to be much higher than you if spotted at a distance).
To fly at actually 36k or above the B-17 must have been without most (or all) of it's bombs, taken off with 100% fuel and spend at least 90 minutes of climbing before meeting you.
You happen to have saved the film?