I'm confused then. I got a Harrier from my 7 kill streak, used it and got a Pavelow straight away thanks to the air strike, I called the Pavelow in too and both of them were racking up loads of kills, but I didn't get my AC-130 until I got 2 more kills with my weapon
The Pavelow and harrier must have got atleast 12 kills between them so I don't understand why I needed to get extra kills with my weapon to get my last kill streak?