> Your cleaning staff can't be waiting around all day doing nothing, they need things to do.
The service staff may have more to do then cleaning, and even without major events like "someone puked in the back", a large fleet is going to have a continuous, ongoing level of cleaning and care needs (much of which, while needed on an ongoing basis, can easily be deferred when a puking, etc., incident occurs to focus on that.)
So its quite likely that there will, at least in major markets, be work for a 24/7 service staff that also handles puke-like incidents.