Were more planes ready to be taken over? This doesn't appear to have been posted yet, so here it is. "The [Chicago] Tribune reported that one source said the FBI was "very interested" in passengers whose names appeared on the manifests of several other flights that were already in the air when the first attacks occurred. None of the passengers in which investigators have expressed interest reappeared when flights resumed late last week, the Tribune reported."
World wide "lock-down" of major parts of major cities. The Malaysian government has detained without trial several Islamic extremists, checkpoints were set up outside the Citibank Tower and Asian-Pacific Financial Tower in Hong Kong, the CN Tower in Toronto was shut, Downing Street was evacuated because a suspect package had been found inside No 10. (The alert was called off within minutes.) Etc, etc, etc.
Planes over London will be shot down, warns government. The UK government warned that any plane venturing into airspace over central London was likely to be shot down. All aircraft movements over the heart of the capital are banned until further notice. The flight path into London-Heathrow airport passes close to the Canary Wharf skyscraper in the east of the city and along the River Thames over the House of Parliament, the Guardian newspaper reports. (Down the page a ways.)