What is the difference between a chemtrail and a contrail?

Chemtrails are not contrails. Why?

• One question I have that I cannot get answered. Regarding the chemtrail debate, why is it that only fighter jets leave persistent trails? Why is it that 2 visibly identical jets fly back and forth over my town,where one leaves a normal dissipating contrail, while the other emits a thick,multi hour trail, flying side by side? Why do the persistent trails start and remain over populated areas and become normal, quickly dissipating contrails when returning back to wherever they originated, over the unpopulated mountains?

• Answer:

  *why is it that only fighter jets leave persistent trails? I have seen trails behind passenger jets. *why is it that 2 visibly identical jets fly back and forth over my town,where one leaves a normal dissipating contrail, while the other emits a thick,multi hour trail, flying side by side? How do you know they are identical jets, further, how do you know they are side-by-side, this is difficult to judge from the ground, which is one of the reasons that many display aerobatics can be performed more safely than perceived. *Why do the persistent trails start and remain over populated areas and become normal, quickly dissipating contrails when returning back to wherever they originated, over the unpopulated mountains? This would require proof and i don't necessarily believe you, however, airports tend to be next to populated areas, and perhaps the thrust setting versus altitude are more prone to generate visible vapour trails where people can see them than in rural areas. Further, there are more people in urban areas so more chance that urban dwellers will worry about them.