I was thinking it might be a good idea to carry one on board with you in case the Russians decide to kill another spy:

Traces of radiation have been detected at 12 locations by experts probing the death of former Russian spy Alexander Litvinenko.
Home Secretary John Reid revealed 24 unnamed locations have been or are currently being monitored, including two British Airways panes.

This is really scary stuff, imagine if you were one of the people on those planes. This has the potential to be made into a very interesting movie when they figure out who did it. Or at least a CSI case.
(via)