that's always a good way of evening up the odds - giving your opponent something with an AA mount
still, flyers are more of an annoyance if anything! if you do get lucky and hit it, more than likely the flyer is at least going to be chased off before it can fire...
imperial navy flyers are for the most rather over-priced for what they can do! with only BS3 and alot of their weapons being one-shot hunter-killer rockets, they're not that deadly
cheers!