I thought a gameturn was about 6 months?
Anyway, let’s say a gameturn equals anything in between 3 to 6 months.
No matter how long a gameturn is supposed to be, German bombers could not reach Gibraltar, not even if based on Sardinia (which is about as close to Gibraltar as it gets). Let alone attack a fleet there and then land in Morocco. Named German bombers had an action radius of 1500km, but those were very few and they were Naval Bombers. German Strategical bombers had a smaller action radious (about 1200km). So how about German FTR/TAC that also can attack a fleet at Gibrlatar if Italy takes Morocco? They had an action radius of only 200-400km… Humbug ;-).
Same story for allied aircraft, although a little bit different: allied aircraft were designed for long range, German aircraft were designed for ‘air-artillery role’. Ridiculously short ranged, very effective against land units and much less so against naval forces (IF they could ever get to attack them, as it was very easy to stay out of their range).
Now for Naval Units. What could they do back in those days, assuming >3 months of time…
It depended a bit on the speed of the ship. A slow transportship could sail from South Africa, load in Plymouth, Liverpool, London, etc., and be part of an invasion of Norway. Battleships, which were a bit faster, could even leave port in Singapore and be part of that same invasion of Norway. The much faster Cruisers and destroyers are the cream of the crop: they could even start in Sydney, sail around South Africa and be part of an invasion of Norway >3 months later.
CV are a bit more difficult to catch, because they differed much from Major Power to Major Power. The US and Japanese ones were very fast and could very easily move from Sydney to Norway in 3 months. UK ones were much slower and would have to start in South Africa if they were expected to show up during the now famous invasion of Norway ;-).
