No it wasn't what Metroman meant but he see it very simplistically as a short term scheduling matter. It can be, as in my case, a scheduling matter because the aircraft can be out of the system for an extended period well beyond a simple turn back.
I might add in addition to engineering repercussions, that I wouldn't recommend accidentally getting into the weather patterns that Volcanic eruptions can create. They are not fun.
Wunwing