It's my understanding that if you bomb down the City center BEFORE bombing the factories, that the factories stay down longer (because they are supported by the City).
I've known that from the get-go. That is why any time I hit an enemy Capital, I always target the Industrial Center. I keep hitting it because I know once it's down to less than 20% (I thought 10% at one point but it's less than 20), that the outlying strats will stay down for a LONG time. Most people I see doing a run on a Capital, hit the outlying strats because it gives a better reward. For me, it's common to log in and see that the outlying strats have been hit, but the Industrial Center is practically untouched. The reason being is the reward is so little hitting it. I could carpet bomb a port with B-17's, salvo 12 delay 1, land maybe 1-2k damage and come away 3-5 perks. Take the same plane, pickle off the bombs myself and land 9-11k damage hitting an Industrial Center...come away with MAYBE 1, 2 perks at the very most. At one point, I actually ignored the Industrial Center and hit an outlying strat just for giggles...I came away with around 3k damage and 5+ perks.
The point is, hitting the Industrial Center gives so little reward that people generally ignore it in favor of the outlying strats. I would like to see an increase in the reward hitting the Industrial Center. Enough to where I could call out, "Strat Raid Forming", and actually get people interested than what it is now. I could call that out now, with 400+ people on, and I'd get damn lucky if at least 1 person responds that isn't a rookie. Even the rookies are scared off by the fact that it will take time to get there and back and that they won't get a very good reward. Might be my own doing as I tell them (depending on where we are taking off from) how long it will take and what to expect for a reward. But I think it's better to tell them then and there and not half way through the flight, or let them find out IF they make it back. Personally, I'd be a little annoyed if I wasn't told it could take 2hrs and give crap perks when I could be trying to bomb hangers and towns in half the time for 3x the perks.