Adding AI planes to a dogfight scenario in 4.10

[IceFire]

On the UK-Dedicated series of servers we've used the old AI plane trick to add B-17s and B-24s and Tu-2s to a variety of scenarios where having a heavy bomber is our preferred method of getting around. It's usually quite a bit of fun despite the lack of cockpits. With UP some people even get to have the hack and slash cockpits so they can fly around from there. Whatever makes people happy right?

Problem is that with 4.10 for whatever reason the AI plane trick no longer works. I've checked a few scenarios but it doesn't seem to be working. At least not the way it used to. Any suggestions?