What ae those airplanes that fly way above the other planes these planes leave trails?

The airplanes you’re referring to are likely high-altitude jets, such as commercial airliners or military aircraft, that fly at cruising altitudes typically between 30,000 and 40,000 feet. The trails they leave behind are called contrails, which form when water vapor in the aircraft's exhaust condenses and freezes in the cold atmosphere at high altitudes. These contrails can sometimes spread out and contribute to cloud formation.