Contrails are the wispy, cloud-like trails that follow jets as they arc across the summer sky.
They are not something most people ever even notice. But for thousands of people across the nation, contrails represent something sinister. See the KOIN chemtrail report Mary Starrett, a talk show host at KPDQ in southeast Portland, reports receiving dozens of calls from listeners who believe contrails are really chemtrails, spewing dangerous chemicals on the unsuspected citizens of the United States, according to KOIN 6 News. There are even dozens of Web pages dedicated to contrails with theories ranging from toying with the weather, to mass vaccinations being sprayed from the sky. Terry Mustain has 25 years of aviation experience and says that contrails are nothing more than water vapor.