1. 
   Contrails
   [book] Contrails is a small handbook issued to new cadets entering the United States Air Force Academy. It contains information on United States Air Force and United States military history; Academy history; notable Academy graduates; aircraft, satellites, and munitions in the current U.S. A...
   Found op http://en.wikipedia.org/wiki/Contrails_(book)
   
   
2. 
   contrails
   1) Airplanes' visible vapor streaks
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/contrails/1
   
   

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