A major terror plot has been disrupted in the UK. The plan was to blow up five to ten airliners above the Atlantic, on their way from Heathrow to the US. Airlines that were targeted: United, American, Continental. 21 people arrested - most of them Pakistanis - possibly up to fifty were involved. This could have been much bigger than 9/11.
Sounds like a remake of Operation Bojinka from 1995:
The aircraft would have blown up over the Pacific Ocean and the South China Sea almost simultaneously. If this plan worked, several thousand would have perished, and air travel would have been shut down worldwide for days, if not weeks. The U.S. government estimated the prospective death toll to be about 4,000 if the plot had been executed.