goddamnit you're retarded, honestly, it's more likely you're just disinfo shills.  this is literally flat-earth level horseshit perpetuated by retards that have no grasp of simple physics or chemistry, and RETARDED FUCKING BOOMERS. CONTRAILS are what happens when the air at wingtips of airplanes gets compressed, and the moisture in the air CONDENSES, CONDENSES!! CONtrail, CONdenses water. what you call CHEMtrails, are EXHAUST trails.  Jet fuel is a HYDROcarbon. HYDRO means WATER, the product of burning a hydrocarbon is carbondioxide and... WATER!!! the trail you see from exhaust is literally that, WATER, it's LITERALLY CLOUD. CONTrails disappear because the consended moisture is already in the air, and doesnt change the relative moisture levels in the air, and will evaporate easily again. exhaust trails have a FAR higher concentration of water in the air, and take longer to evaporate (also depends on the relative moisture levels/temperature of the air around it) you people are FUCKING RETARDED! edit: YEAH DOWNVOTE THAT NON-BELIEVER!!!