Fatigue factor ??
Out of simple curiosity and interest, how many 'crew' should there be; in an ideal, sane world.
Never thought about it much, but there must be a 'minimum' sort of roster, variable I guess but if we are chronically short on a regular basis, then it's a real worry. The troops may conceivably carry the odd shortage, Bloggs falls of push bike on the way to work, Jones has flu and Smith went to bucks party etc. so there are some holes to plug, but this must raise the issue of fatigue.
It's probably fine to cover the odd shortage, but on a regular basis? – I wonder how many are operating below par, simply because they're knackered.
Much is made of pilot, flight attendant, truck drivers etc time on duty, have the ATS troops got such a thing??.