Before anyone else offers 'suggestions' for attacking air transport, I would say a few things:-
1) The opening scenario would be so difficult to achieve we can effectively dismiss it.
2) Regarding 'bombs in the hold' - that scenario is also ignoring not just the NORMAL procedures but the heightened security procedures now in place.
3) Several people have commented on (and complained about) the wisdom of giving 'nutters' or others ideas, however unlikely, via threads like these. It is a pointless thread in a way in as much we all face a real threat in the UK today, but the thread starter has had nothing to offer as a suggestion, only floated an 'idea'. I do not consider that serves any useful function. I have decided it will be closed now.
As a few have said, let us not raise the anxiety levels through 'odd' scenarios like these, which as a few have said, play right into the hands of those who wish to create 'anxieties' in our society. There are enough real ones all around us to keep us, and those charged with our safety, on our toes.
........and as for the gent's toilet threat, now that IS a worry