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their whole fleet brand new? Surely they don't have very many mechanical issues?
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New aeroplanes don't necessarily break down less often - might be a different sort of breakdown to older ones. This is more a cause of 'on the day' schedule changes (ie delays, cancellations, diversions) than 'in advance' ones.
Advance schedule changes may also come from a rejigging of aircraft cycles.
For example: under the 'old' schedule you might have had Aircraft 001 going A to B to A to C to A and Aircraft 002 doing A to C to A to B to A. Under the 'new' one 001 goes A to B to A to B to A and 002 does A to C to A to C to A. Still the same number of flights to each port, but if the sector lengths are different obviously the timings will change for the later ones.
I do Like Owen's explanation though: "Operational Requirments" as the general purpose excuse. It sounds technical enough that it works for most passengers!
