Ok - so it's my paranoia again. This and similar questions relating to technical specifics have taken on a whole new, sinister countenance since " that day ". Why not ask, " how much would be possibly left on the tanks after a sector of such and such a length and how big a bang could it possibly make ? ". If in fact you DO usually "hand" out in the cabin crew forums, one could presume that you are crew and would have no problems asking one of the tech crew these questions as you sat in the bus on your way to the pub. Is it asking too much that "professionals" give more than 1 second of thought to what they place in the public domain. By the way, the argument that if they didn't get it from here they'd get it from someplace else, doesn't wash with me. Every professional in this industry has a new security imperitive to live with on a daily basis.