Yay! I was the player who attempted to bring the planes. It was… controversial… in our group so we decided to not make the move to move the game along. It seems in the spirit of the rules, if not in RAW, that you can protect transports with planes… just like you would with non-bombarding surface warships… I have a feeling this issue will still not be decided unless Krieg weighs in…
In my opponents defense it did look fishy. It was 4 german transports with no other ships conducting an amphibious assault on empty Archangel and Nenetsia from empty SZ127. There were 3 Russian Fighters in Novgorod that could scramble to auto kill the transports before they landed. So the German player brought up 8 planes to SZ127 to protect against the inevitable scramble and they would land in Axis Finland. It was an odd move and looked silly with no surface warships and just planes, something that our group isn’t used to seeing, but it seemed no different in terms of the rules than sending destroyers up to the SZ to protect them…