Maybe the 6/8 means that 6 air units are located at that airfield but the max allowed is 8. If they are using this sort of system for airfields by making you build them and expand it to hold more units ... will they could also be doing this to ports. This would stop the whole German navy from hiding in one port and keep people from building 40 sub units and deploying them in one place. If they could somehow use this system and incorporate the resupply system to only allowing so many ships to enter the port at one time large ports would have a huge value. Various units could also have different capacity values (Carriers, Battleships=2)(Cruisers, etc=1)(Transports,subs, destoyers=0.5) with the same being used for bombers, fighters, etc. This would keep the game realistic in not having 10 carriers in one small port.