How do I get engineer specialist 2 if everyone Flys like their in the airforce?

I just did that one last night, but I had to use a combination of the AA launcher, the mobile AA, and LMGs. If it helps, I was playing Escalation and mostly targeted helicopters, although I did get a few jets too. 

I think it's mostly a case of grinding it out and biding your time, or hoping there's other people who you can gang up on aircraft with.