PPRuNe Forums - View Single Post - Vapour Discharge from 747 at cruise altitude
Old 2nd January 2016 | 11:44
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750XL
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Joined: Sep 2009
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From: England
The long dark streaks you see on the underside of some aircraft are often from coffee poured down the drains:

Photos: Airbus A330-223 Aircraft Pictures | !!!!!!!!!!!!!!
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