Playing CHS 2.08 scenario 160 (PDU on) in this game. This might be something the developers would like to take a look at.
I'm aware of this feature that substitutes planes scheduled to arrive as reinforcements when there are insufficient numbers in the pools.
I had a group of Hudson type planes scheduled to arrive on 6/6/42 in Calcutta. I didn't bother to check the base because of bad weather in the area this turn. I got the replay back and saw this:

At first I thought I was hit with the sync bug but when checked was in sync. I checked the aircraft at base list and they were scheduled to naval attack. I checked the aircraft itself and there wasn't any mission assigned at all.
This leads me to believe that there needs to be a conditional check on the plane type if substituted and change the mission if necessary to something that the aircraft type is actually capable of performing.

