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Originally posted by jaxnmarko
Obviously beer kegs for a party flight! Fasten your seat belts!
But the trails are actually coming from six smoke generators. It was part of a NASA test to study wake vortices, you can read about it here:
Six smoke generators were installed under the wings of the 747 to provide a visual image of the trailing vortices. The object of the experiments was to test different configurations and mechanical devices on the747 that could be used to break up or lessen the strength of the vortices. The results of the tests could lead to shorter spacing between landings and takeoffs, which, in turn, could alleviate air-traffic congestion.