Contrails are a product of a certain combination of humidity and temperature in the atmosphere. The combination occurs most often at higher altitudes. However, Rhube is quite right. One of the most famous photographs of dogfighting during the Battle of Britain shows contrails behind a goodly number of the aircraft which I believe were Messerschmidt 109s and Hurricanes. Not a jet among 'em.


The idiot also known as Capfka ...