I read in Business week or similar a few years ago that the keep a "mobile depot" on stand-by for Wx events.
It is 2 - 4 aircraft packed with everything from IT to food/bedding etc that would be needed to rock up to a hangar and turn it into a hub in the event that another hub is out of action...
kind of a hub in a box (or MD80...)
They are used when regional hubs are closed due to hurricanes/monsoon/flood etc world wide.
iX