> just enough to ignite the cargo and force the plane to land

That 100ml limit on liquids is ridiculous. Some nasty co-reagents
could come in 100ml bottles. Peroxide + catalyst, phosporous,
cyanates, nerve gas, biologicals ........

PIC10F and a piezo igniter, how small could you make that ?

Needle in a haystack of needles. Don't envy the guys at the coal
face one bit but, apart from the psychological factor for the benefit
of the travelling public, is it at all actually necessary or fruitful ?

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