Oh, no, that'll never happen...
I read Command and Control not too long ago. The author did a very good job of putting most of the bombers-vs-ICBM, faster-higher-lower-invisible-er strategic weps delivery thinking in context and perspective. Plus some really hair-raising shit on how long it took SAC to adopt the idea of multiple safeties on their nukes, and how many accidents and accidental detonation close calls there were over the years.
Like this:
http://en.wikipedia.org/wiki/1961_Goldsboro_B-52_crash
Or this:
http://en.wikipedia.org/wiki/1966_Palomares_B-52_crash
Like kids playing with fire, it's remarkable that the combination of essentially first generation jet aircraft, 2nd or 3rd generation nukes, and 24/7 airborne nuclear alerts did not lead to an actual disaster.