The only way to be invisibile to mad/sad sensors is :
- either go deep
- or the aircraft is flying at high altitude
- or the aircraft is flying at low altitude but not passing over your head.
You as a sub skipper have control only over the first point.
If the environment doesn't give you deep waters you don't even have this choice so sooner or later the air units will get you.
In this case you have to shoot them down unless you want to be sunk by an air dropped torpedo launched directly over your head.
The tactic for shooting down air units is to stay at periscope depth. Use esm for bearing information and periscope for visual confirmation. Once you have the p-3 or helo in your periscope pop up and launch several sams. Depending on the mod the time to recharge can vary quite a bit. So always try to shoot down the enemy on the first sam.