Update
Pilot killed
To clarify this point, when in the rules I say "until the pilot is found to be killed" I actually mean "when the pilot is shot down in any possible way" so normal shotdowns, pilot killed chits and plane exploded chits all mean that the pilot is killed.
Some of you suggested that the pilot has only a certain chance to be killed when shot down: if I have time, I'll modify the software that process the results before the start of the campaign so that normal shotdowns kill the pilot only 50% of the time, but for now all shotdowns mean pilot killed. I'll let you know more on that in the following days