If you are in the UK you are probably aware of the death of the Alexander Litvinenko, and the on-going investigation into some of British Airways's Boeing 767s. It appears one of these aircraft was working on the London Heathrow - Barcelona route during the week of Tech-ed IT-Forum. The flights involved are flights BA478 (from London at 07:25) and BA479 (From Barcelona at 11:35). I flew BA, but not on the affected flights. More information is available from a link on BA's Home Page, including what to do if you were on one of them.