We aren't impossible to take down, lol.
Just get a bit better in the jet yourself and handle your team's air superiority on your own.
No ace is invincible.
Our effectiveness also goes down exponentially with the number of lock on weapons on the map at any time. An ace can almost be useless if facing a combination of stingers, heatseeker jets, and heatseekering helicopters. It'll take us a few minutes to clear our areas in that situation, which is a lot of leeway for ground troops.
If you want to deal with an ace, essentially, use teamwork. Otherwise, you'll get smashed. That's how Battlefield works; not this ridiculous 'rock-paper-scissors' system that so many of you want.
I've chased aces long enough where they lost sense for a moment and plowed into something. Or had them tail me while a wingman gunned him down. Sometimes I died, spawned in a jet and managed to get behind an ace and shoot him down. I'm even guilty of jet-ramming a few simply because I couldn't manage any other way to get them down. I'm not proud of that, but it is a last-ditch option. My point is, they aren't invulnerable.
As echoed before, jets are the top of the chain. But in the end, the operator is human and prone to making a mistake somewhere, you just need to force them into it somehow. And for crying out loud, a single pilot cannot control the entire field and getting 2 top-aces is VERY rare. One person may be able to do a lot of damage, but there are areas that are inaccessible to most pilots (like the inside of a building).
"Jets SHOULD control ALL air and ground vehicles. BUT jets should NOT be able to come into meters of the battlefield and destroy enemy infantry. They need to stay up in their kingdom of the sky and take out vehicles to help their infantry units advance and take and keep objectives. Jets are NOT the gods of the game. Every class/vehicle has a role in this game. If you step outside of that role you SHOULD be killed because your stepping into someone elses kingdom. ;) "
There are numerous ground hazards, plus any tanks/rpgs that may come your way. It is not as if a jet is invincible.
Honestly, learning enough to be a threat in a jet isn't hard or rocket science, it takes time. I kept getting owned by pilots and instead of coming up with excuses to nerf them, I learned (with help) how to fly like them and counter them. Everything does adhere to a rock-paper-scissors type of gameplay, but sometimes the weaknesses are not so obvious.