For the people that are having the issue of not being able to buy it because of a single airframe, which airframe do you own?
The reason I ask is because if this is just affected F86 owners it would make sense as the campaign started off as a Mig15 only mission. If that's the case, that that might help ED / Apache figure out the issue. If this is affecting Mig15 owners as well, then I'm out of ideas.