What could be the aviation strength, 60+ or 40+ or 40- configurations?
45 fighters for each carrier that's 45k DWT, so you have 30 jets available. About 60 for a 60k DWT, with 40 jets available. The remaining components would be helicopters, AWACS, transports, whatever.
The rule of thumb is one aircraft for every 1000 tons of weight. So on a 60k DWT carrier, you can have 40 jets and 20 medium/heavy helicopters, AWACS etc. You can carry even more if necessary, considering many aircraft can be rotated between the air and ship. I suppose 20-30% more aircraft can be in the air. Of course, you will need emergency landing strips around.