@jacobg I think that makes airplanes too vulnerable. You would need to make them cheaper.
Cheaper airplanes and more effective AA might well be more realistic, but be careful about shifting the balance.
To add some diversity and other strategies to winning.
21 points to win (Axis pts/Allied pts) Axis starts with 9 Allied starts with 15
2/4 Germany - Berlin
2/2 Southern Italy - Rome
1/1 Norway
1/1 Northern Italy
1/2 Poland - Warsaw
2/2 Eastern US - Washington
3/2 United Kingdom - London
2/2 Russia - Moscow
2/1 France - Paris
2/1 Egypt - Cairo
1/1 Novgorod - Leningrad
2/1 Ontario - Ottawa
1/1 Volgograd - Stalingrad
1/1 Union of South Africa
1/2 Suez Canal
2/1 Gibraltar
1/1 Greece
2/1 Iraq & Persia
2/1 Libya & Malta
1/0 Axis units in S. America
1/0 No Russians W of Kar/Ukr
0/1 No Axis units in Africa
1/0 Strict Neutrals in place
1/0 No US in France & Germany