1.   He suggests that tiny particles of soot in the jet exhaust may be traveling downwind and becoming the seeds for ice crystals elsewhere.

2.   Inhaling a sudden blast of jet exhaust.

3.   The rotor is driven by jet exhaust channeled through nozzles in the tips of the blades.

4.   Sulphur contained in the jet fuel exhaust condenses into particles within minutes, he said.

5.   Tyurin and Dezhurov promptly installed a Russian experiment to evaluate contamination from jet exhaust.