I read somewhere that if you using more then x32 TC, there is no danger from the planes

I think you will find that anything above x128 TC reduces the chances of encountering aircraft. x128 TC and below is unaffected, that's why I play at x128 TC maximum.

Nemo

I've been playing x256, and always find plenty of ships.
Dunno about the aircraft though.
After Capt. Nemos post, I may reduce that to 128. Aircraft do seem a bit thin on the ground.

I think there are a variety of views on how TC affects aircraft encounters. Based on reading many threads on the subject, plus my own experience over nearly 200 patrols, I believe that moving from TCx128 to TCx256 significantly reduces the number of aircraft encountered, and changing to the TC factors above and below this has some effect. There isn't one TC change that is an on/off switch. Furthermore, the higher the TC, the more likely the aircraft you do encounter will be close to you when you drop out of TC.

I tend to run at TCx32 when I am surfaced in an area covered by aircraft. This means the aircraft find me but I often spot them when they are far away. I use TCx128 when patrolling submerged, and higher TC settings when transiting submerged or surfaced and either outside of air coverage or when aircraft can't fly (fog medium or heavy).

"Aircraft do seem a bit thin on the ground."

A pity, because that's exactly where I want them.

Thanks for the info on Save v. Load and resets. I've been wondering about that, because I hate losing a week's worth of cruising after a computer freeze, but I hate going a week without a weather change, too.

One option you might consider is instead of saving a game, hit escape to go to the save menu, then minimise to desktop (Alt+Tab), then tell the computer to hibernate. When you reboot your machine, click on silent hunter in the taskbar and off you go.
I've been using this a while now as i have a troublesome GWX2.1 and I get crashes when I reload a game with any sort of 'action' going on so to speak.