Whippersnapper.
Thanks for the clues to all terrorists reading !
I hope you are aware of other systems employed since then.
If an airliner is going for a prime target ( assuming both old intel' and old countermeasures ), I'm afraid Joe Public comes second, and it would probably have been called an onboard bomb; hopefully not that, just other worries now, of which I am happy to know only a smidgin...