If it is power issues and some bit of infrastructure deep in the back end took a nosedive, wouldn't be surprised if it effects multiple front end systems.
Considering it's an airline, it's likely either a IBM i or a IBM Z System where they track everything relating to their flights (schedules, reservations, checked luggage, etc). A lot of companies (mine included) seem to thing these devices are high-availability giants and never test what happens should they go down. I know if ours ever took a dump we would be in some big trouble (though we could function for at least 24 hours).
http://qz.com/417617/every-united-airlines-flight-was-ground...
and again http://www.pcworld.com/article/2945552/united-airlines-fligh...
and again http://newyork.cbslocal.com/2016/05/29/computer-system-shuts...