How is it regulated that planes do not collide in the air?

I know that planes are assigned airways and air traffic controllers regulate takeoffs and landings, so plane collisions are almost impossible. But 1. Airways from different wings do sometimes cross, and an aircraft always flies at different speeds, and then the aircraft could crash, at an airway intersection? 2. As I said, airplanes always fly…

Do you think there will be more serious air disasters in the future?

Flying is known to be one of the safest, if not the safest, means of transport. Do you think that there will be more serious(!) aircraft disasters in the future, which could even surpass the most serious aviation accidents to date (Tenerife, JL 123,…)? Of course, I can hope that such aircraft disasters occur as…