Big John wrote...

I have thousands of hours in jet fighters breathing 100% oxy.

We had all kinds of electrical stuff in cockpit(s) and aircraft. High
power Radar, Radio's, etc., etc.

But you had a mask sealed to you face (usually :-)
Cabin pressure is/was(?) usually supplied by engine bleed
air and is not 100% O2.

OTOH, I have flown with a smoker before, but he took off
his mask and shut off O2 before lighting up.

Also had a friend get a shock by a short in the lip
mike in his mask. There was some 'discussion' about
sparks and oxygen in the cockpit following that one.

Dave 'foom' Hyde