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There was a video that involved DAN Europe (in Italy IIRC) conducting flying after diving where divers actually went on a dive then got on a plane after a surface interval. The preliminary indications pointed to a wait of over 18 hours as the preferred time frame. I didn't book mark the video so I can't find it, nor have I seen the final report. If anyone is familiar with this please post it.
Here is a statement on DAN Europe's website:
"The current position is: wait AT LEAST 12 hours after a single No Decompression Dive and 24 hours after repetitive, multiple day or decompression diving.
DAN's recent results suggest that in the second case an interval of 17 hours will probably be safe, but the study is still going on and the official recommendation has not changed yet."