DAS on airliners has been looked-at many times, both in Europe and in the US (and of course, in Israel - who actually do it).
Here and in the US the airlines have been unwilling to pass on the enormous cost to pax and Governments have been unwilling to force the issue for fear of the knock-on implications of publicly acknowledging the reality of the threat.
If one of the unintended consequences of the Libya push is a major new injection of MANPADS (did the mad Col. G have any Gimlets? ) into the hands of 57 varieties of not such nice chaps, then major rethink required.