Category Archive: NASA / Aerospace

Predicting Contrails – Contrail Science

Sometimes planes leave contrails, and sometimes they don’t. It depends on the weather, and specifically it depends on the weather at altitude. It’s also very localized. A plane might leave a trail in one region, and another plane a mile away might not leave a trail. NASA have put together a contrail forecast page that …

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Boeing, LAN Airlines Announce Order for Three 767s – Air Transport News

Boeing (NYSE: BA) announced today that Chile’s LAN Airlines ordered three additional 767-300ER airplanes valued at $493 million at today’s list prices. Today’s order brings the total number of 767s ordered from LAN to 33. “This order for additional 767s builds on the long-standing relationship between Boeing and LAN,” said Marlin Dailey, vice president of …

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Why do some planes leave contrails, but others don’t? – Contrail Science

A question that comes up with some consistency is based on the observation that some planes in the sky leave trails that persist and spread, and other planes, in the same sky, leave short-lived trails, or no trails at all. This difference is often used as evidence of the “chemtrail” theory, which states that the …

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Contrail Grids are not Chemtrail Grids – Contrail Science

This enhanced infrared image from NASA’s Terra satellite shows a widespread outbreak of contrails over the southeastern United States during the morning of January 29, 2004. Satellite data are critical for studying the effects of contrails. The crisscrossing white lines are contrails that form from planes flying in different directions at different altitudes. Each contrail …

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