After playing Battlefield 2142, Battlefield 1943, and BF:BC 1 & 2, i've noticed a huge lack of people who spot enemies in this game and trust me it makes a huge difference especially to pilots who can't see the ground very clearly and people looking for pesky snipers. All I ask is that when you see an enemy soldier or even a tank, helicopter, or even an enemy plane please just put your crosshairs on them and simply hit the back button. When you do this it will put a blip above said enemy and on your minimap at the enemies location that all of your team can see and you will even get a 20xp spot bonus after someone else kills/destroys whatever you have spotted. This REALLY helps pilots find enemy planes or helicopters in the sky that aren't easily seen and the location of tanks so the pilots can do a bombing run on them.
Your friendly neighborhood pilot.