A few things to remember when positioning escorts:
1. Separation. Imagine a bomber with a fighter on each side of him at 6.0k range. With icon range of 6.0k it means the three aircraft can scan a piece of sky that is 6.0k x 4 = 24k wide. That's 13.6 miles! But you can only fly at this distance if the bombers have a good visual scan and they give accurate and timely course information.
2. Relative speed. If you are in front of the bombers, it's easier to get to the rear of the bombers than vice versa. If you are behind the bombers and there is a frontal attack, you will have a hard time stopping it. But if you are in front of the bombers and there is a rear attack, you can get back easily because the bombers are flying towards you. So being in front is superior. But again, it requires that the bombers give you timely and accurate course updates so you don't miss a turn and leave nobody in front of the bombers. Also the separation rule applies here - if you are 6.0k in front of them you can get an icon on a bandit that is 6.8 miles from the bombers, which gives you a nice early warning.
3. Altitude. If you are below the bombers you can't protect them from a co-alt or higher bandit. But if you are above the bombers you can defend against higher, co-alt, or lower bandits. However if you go too high, you are too far from the bombers to see icons on bandits that are below them. 5k feet is about right. 10k is way too much and you are asking for a slaughter.
If you have just one plane I would go about 3.0k in front and 5k above. This puts you in a position to intercept a very high percentage of the bandits, and gives you a decent early warning.
If you get multiple planes, you can add some on each side, spread out. You can also put some slightly behind the bombers as a back door guard.
If you start getting into multiple groups of escorts then you can assign some guys to stay with the bombers and some guys to be able to engage freely. Always keep at least one group in a good position to defend an immediate attack on the bombers. But you will get a benefit from allowing some of your groups to engage enemy fighters before they can climb to attack, or before they are even sure where the bombers are. The more planes you have, the more you can spread out, and the more real estate you can cover visually.
If you are really interested in this stuff, check out this book:
http://www.amazon.com/exec/obidos/ASIN/1855329077 That book is the real 8th AF fighter commanders telling how it was done in WW2.
[ 10-19-2001: Message edited by: funkedup ]