positive lightning
Hajik also refers to the l999 composite K-21 glider brought down over Dunstable; and I mentioned before that the UK Air Accident investigation found that the control rods were melted by the voltage of the strike, a more powerful one than anticipated by current airliner design.
We suspected that the pilots had been flying too close to the base of the cu-nimb. They survived (by parachute after the glider broke up in midair) to testify that they were several miles away from any cloud when struck. This was corroborated by witnesses on the ground.
So you do not have to fly into a cu-nimb to be clobbered.
I hope that designers of composite airliners have studied this report.