-Aircraft stat is disabled, e.i. it has absolutely no contribution to anything at all, e.g. AAW resistance, load time, speed, sight range, firepower
-Fighter and bomber stat do absolutely nothing to contribute to a scout's ability.
Disclaimer: The above are taken from patch notes.
There are a lot of rumors and claims going around about abilities but most lack testing and evidence to back them up or they are mere observations, speculations, and placebo effects. There are discrepancies among the best CV players and even mods in previous threads about similar subjects.
Best way to find the right answer is by reading through the patch notes yourself, sending a support ticket to a GM, or doing some testing yourself (compare +7 to a +12 to EBVE scouts. if you actually do this, some of us might appreciate it).
For now it is best to be skeptical of anything anyone posts on these forums, including myself.