From: Georgetown, Texas, USA
OK, I'm on 1.801, and I still have some Glen squadrons that have no planes and won't fill out. The new "get plane" button is greyed out, even though I'm in a port with plenty-o-supply. Wasn't this supposed to be fixed?
I haven't spent a ton of time trying to characterize this, because I thought I'd check first and see if this is a "well, yeah, we know this" problem first.
Yes, there is a problem with single plane airgroups assigned to submarines. They get their max aircraft set to zero, so can not accept aircraft. Glens are used in these airgroups so that may be your problem.
And yes, it was supposed to be fixed. I made a change in 1.8, then a correction in 22.214.171.124. Now there's a fix pending for 126.96.36.199. I may have to give myself a good talking to about this one.