Condensation trails (contrails) form when aircraft engine exhaust rapidly cools to form ice crystals. Contrail formation is dependent upon the atmospheric temperature and humidity, aircraft engine type and thrust setting, and aircraft fluid dynamics.
Pilot Alert System
Designed, manufactured, tested, certified and maintained by Ophir Corporation.
The Pilot Alert System (PAS) is a light detection and ranging (lidar) system designed for detection of contrail formations behind the B-2 Stealth Bomber.