The HO was NOT done in Real Life. Maybe on one or two accounts it would be done, but in RL they saw the risks of it. Usually both planes would go down. Usually wasn't such small numbers as we see in AHII so after you shoot down one or two, you can't come over your area vox and say your goin home, you gotta stay and fight till they either head for the hills or are all dead. (Persoanlly I wouldn't care much for fighting a A6m in a p38 [US's main primary fighter] with missing aeilrons, elevators, fuel hits, wing chunks missing etc...) If I were to engage zekes or KI's or something, I'd wanna STAY in my prime, not risk it for an easy kill/death. The HO was usually done widespread (20-50 guys lined up on each side) the few times it was done when it was, all the pilots regarded it as "Playing chicken" or "seeing which one would pull out of it first"
In other words, none wanted to do it. It's cheap, takes minimal skill, and WASN'T done in RL. It was not apart of the AF's for any country (even Germany's and they had ramming 109's, so, in all truth, you can argue that a 109 ramming a bomber is historically accurate)
But try not to confuse a HO for a HM (Hot Merge)
I love when your in a stall fight (usually my corsair) and on the merge, you pull the trigger and you get accused of a HO. HO's aren't in my bag of tricks (unless i'm in the 1c and they initiate it, then I let the 20mm's do the talking :] )
HM's and HO's are two different things with similar outcomes.