terry writes:

Economics 101 fixed costs and variable costs. fuel use per pax per
mile ( the main variable cost in running an airline ) decreasses
significantly for any aircraft as no of pax increases. so its pretty
obvious that flying airliners with MT seats becomes less sensible as
fuel prices rise.

But pax numbers were not mentioned. All else being equal, fewer flights
equals less utilization of assets. If pax numbers per flight are also
changed, that has to be specified.