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#Repost The “chemtrail” clouds that spread and sometimes cover the sun are alleged to be many things: highly poisonous, metallic, magnetic, a chemical cloud, a dust cloud etc. These clouds that linger, often being observed in busy flight path areas, are also traversed by other aeroplanes, either at the same cruising altitude or while ascending/descending. Aeroplane cabin air conditioning and ventilation systems continuously ingest external air at the engine intakes, pass the air through filter and temperature regulation packs, and then into the cabin, then vented to maintain a constant flow of fresh air.Depending on the composition of these unknown clouds, one or more of the following effects might be expected by aircraft encountering them:- Contamination of cockpit windscreen- Smell in cabin- Haze in cabin- Passenger reaction to toxic chemicals - Rapid blocking of cabin air filters, or frequent service requirements- Engine surge, flameout, torching from exhaust- Melting of contamination in engines- Fouling airspeed pitot tube, critical instrumentation error- Static electricity dischargesMetallic trails/clouds would likely be detected by air traffic control radar and cockpit weather detection radarBut none are reported …