Never been all that bothered by the jets. (Although those professional slow flying mother ****ers will make you piss blood in anger sometimes.)
To me it's the choppers. They have GOT to take more damage from varied sources than in BC2. Because they'd just do strafing runs on the AA guns all day and night, or pull that full tilt gunning rotation thing so it's almost impossible to hit them with Gustavs or tracking darts. And then they dump their tracking dart with counter measures. And it took probably close to 500 rounds from the Abrahm's machine gun to actually kill it.
Compared to BF2, where they could take damage from small arms fire, at least enough to scare them, they were totally broke in BC2.
Just saw this over on Gamepsy:
Rocket and Grenade Launchers:
SMAW
RPG-7
Javelin
FIM-92 Stinger
SA-18 IGLA
M136 AT4
Stingers and Javelins say good things to me about people's basic anti-air capabilities. Finally putting a launcher into player's hands that auto-locks on to heat signatures (like the AA from BF2) rather than being this ludicrous self-guided missile you're supposed to hit a fast moving target 300 feet in the air with. Sadly, Carl Gustav is sitting BF3 out.
Here's the full list of weapons btw.
http://pc.gamespy.com/pc/battlefield-3/1189271p1.html