There isn't a problem with the mob spawn times on air strike codes, half the time you'll have a mob you've just killed spawn on your backside as soon as you've moved on to the next. The problem is the amount that actually carry the codes, chances of finding a mob that has one is slim at best.
It's the first 2 Mobs at the opening of the Data area. The 4 NPC Twileks drop the codes. They spawn in 2-3 minutes, and are constantly camped.