I have long studied the "birds of a feather flock together" phenomena in AH. Rather than write a lengthy essay on it, I will sum it up for you...
Bish Mentality: One toolshed is worth 1,000 deaths. Bish will suicide themselves in a frenzy of mindless HO'ing or pork n 'augering if it means even the tiniest hope of taking a field. There is nothing sacred to a Bish when it comes to landgrabbing, the ends justify the means. From a fighter pilot's perspective I find Bish have a much lower skill quotient in general than the other two countries.There are exceptions but if I see a swarm of HO'ing Lgay7's and Spit16s spiral diving after a wingless fuselage, I don't have to look at their icon to know they're Bish..
Knight Mentality: Knights really like to establish CAP and farm kills, not necessarily by design. A distinct lack of bomber pilots and people who generally fly heavy means long periods of vulching. Knights will tend to establish CAP over a field and vulch patiently for hours while their lone buff dude flies back and forth taking town down and fetching troops. From a fighter pilot's perspective Knights have a broad spectrum of skill levels of relatively equal proportion, from the guy who can only get kills vulching to the steeley eyed predators.
Rook Mentality: Rooks tend to be all about the furball. Base taking is completely secondary to the furball. Generally, Rooks will dogpile a good furball until the point their numbers create a situation where taking the enemy's base at the other side is the only thing left to do, so they do it. Rooks therefore tend to end up gang-banging alot, because they are individually drawn compulsively to the largest concentration of aircraft on the map. From a fighter pilot's perspective Rooks have a much higher proportion of the category I refer to as the predator, usually experienced fighter pilots who do alot of killing and relatively little dying, so tend to fly higher than average.
Zazen