Snipers:- Remember to not only camo yourself from front, back and sides - But also ABOVE.
Often I see snipers laying out in the open when flying, and they become easy targets. - Change location regularly. I love hunting for snipers, and when I find them I SLICE AND DICE

I listen for the shot, I scan the area for possible hidingspots. Then I go hunting, you better move...
Engineers and Rifles: - Repair.. repair and repair.. The more and longer you keep things alive, the bigger advantage you have as a team.
- Putting out mines can be great idea, but not if they lay in a middle of ... nothing. Think smart, place em, hide em, where do the viecles MOST LIKELY go ?
- Using C4 / Expacks is great way to eliminate the enemy, but try to maximize your destructive level by placing them strategically right.
- Rifles are great, some prefer Machineguns- I don't. (Even in close quarter battles). This takes practice, but when learned - Extremely deadly. The idea is 1 shot = 1 kill. You save bullets, time, and it's a F****** Good feeling
Air / Pilots: - Your new, someone is on your tail.. You try to loose the enemy, and in a panic you go STRAIGHT UP.. You stall and crash, or enemy kills you.
NEVER go high or straight up, when being chased.First of, when flying SPEED is key. GO high, VERY high, so high it almost stalls. When doing evasive maneuvers, speed helps you gain turn, twist and dive abilities. Sometimes if fast enough, you get behind the enemy and now YOU are the predator. Avoid flying low be general, keep your altitude and dive bomb on your targets. They won't notice what happened, untill its too late. But never go high or straight up, when being chased. TURN, twist, and use your camera views to find out where he is.
Take some time and read up on the plane specs, there are sites out there (google). They will tell you the difference between the planes, power, maneuverbilities, some are faster, some are better at turning, curves.. etc. Know your opponent's weaknesses.
Strategy / Objectives. First priority is ENEMY PLANES. Your in the air, but so are they! They are your worst and formost dangerous obstacle. Kill enemy planes first<<<
Second objective AA's (Anti AIR stations / guns), AND aircover for moving in ground units. If AA already active, that is your primary objective. You can't provide sufficient aircover, while being flakked by the enemy.
Change flight pattern. As stated many times before in the above posts, predictability is a big factor in this game. They learn your patterns, and you start dying alot.
Just like on the ground, Infantry, tanker, or pilot. Whatever you do, don't do it continuously. Sooner or later, they will pick up on it and intercept.
*Tip for Infantry!
Your in a server, and a pro pilot goes in the air. The shows begins, constantly owning you and your teammates for what seems like ages. Rounding up 50 kills in no time!
Those exists, and the best tip for you as infantry? Take cover.. Stay on foot, stay out of sight. DO NOT GIVE THEM TARGETS. They look for everything moving, jeeps, tanks, apcs, AA's, and machinegun fire. HIDE! Good time to move is when the pilot is making a turn, NOT when he has his back to you. (He uses camera view to look back). I do it myself all the time. I miss a target, I look back as soon as I passed to see where you are going. Jeeps might get you faster from A to B, but also an easy target for a good pilot.
Remember! If you can see the enemy, there is a good chance the enemy can see you!
-opus