Of course, the plane has lightning protection equipment. The Airbus A330 in this accident is a quite advanced passenger plane. It has a good flight record before, and ordinary lightning strikes will not threaten it.

Military matters needing attention are more detailed, and the principle can be seen from books about tip discharge, which is difficult to explain clearly in a few words.

If air strikes can't be launched in rainy days, many classic war cases will cease to exist.