Good Read http://spectrum.ieee.org/riskfactor/computing/it/it-hiccups-of-the-week-southwest-airlines-computer-failure-grounded-all-flights?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+IeeeSpectrum+(IEEE+Spectrum)
Hm. Besides suspecting a power outage it doesn’t really give any insight to what really happened AFAICS.