Transformers War for Cybertron Escalation level 15?

On transformers war for cybertron, are there any tips on getting past level 15? I've heard of an Air Raid glitch , but can't find it in detail; will someone tell me please? I really need this achievement.Transformers War for Cybertron Escalation level 15?The vid is up on either TrueAchievements or 360Achievements. There is a spot you can control the enemy flow to a degree. I think it works with any of the fliers.