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In August 2006, there was a plot to use liquid-fuelled bombs carried aboard flights bound from London-Heathrow to multiple US and Canadian gateways to blow them up in midair. IOTL, these terrorists were caught by British authorities just before they launched their plan.

What if they hadn't been caught, but instead, were able to smuggle their bombs (in separate parts in their cabin baggage) aboard the London-to-North America flights at Heathrow, then assemble them and activate them during the flights (either mid-ocean or on approach to their target gateway airports)? What would the damage be, and the consequences?

I was an American student studying at King's College London at the time, and made frequent transatlantic trips back and forth between my midwest US home and London, so I could have been on one of those flights if things were just a bit different.
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