Random question...

Do any of you good people happen to know whether you'd be allowed on a flight with these in your luggage? 

http://www.sciencemuseumshop.co.uk/outdoor-living/product/270847/flying-lanterns-10-pack.html

I've got four of them stashed under my office desk waiting for an occasion and was suddenly struck by the idea of lighting them on our balcony at the end of the Venice carnival.  (But not if it means getting arrested for terrorism...)