this greatly depends on what aircraft you are flying
two exapamples
If your in a J8a then turn! turn like the seasons!
if you are in a p-47, dive!
It also depends on what aircraft you have behind you.
If your faster. run.
if you can turn better. do circles
But most of the time, when you have a bandit behind you, your already as good as dead.
the trick is, NOT to get him behind you.
Situationall awareness plays a great role here.
if you dont know where the bandit is.
you are dead.
if you KNOW where he is, you have a chanse.
a even greater one if he hasnt spotted you first.
keep looking around, and always know where everybody is.
avoid headons like the plauge.
they hurt.
learn to fly whit one hand and use the other hand to look around with the mouse, if you dont have track-ir.
as said, you have to know the weaknes of your aircraft, and avoid them
at the same time you have to know the weacness of the enemy aircraft, and try to bring the fight towards those areas.
take early spit vs fw-190
the spitfire can turn cirles around the fw, at LOW SPEEDS.
if the fw driver manages to lure his enemy into a high speed fight, he will win 99% of the time.
same thing if the spit can get the fw-190 slow and turning. the spitfire will win 99% of the time.
if you have any tricks to share, then come with them.
.......sorry to nit pick 
but i thought you'd like to know 
