Originally Posted by
MIAman3
They should always have easily on hand high failure rate items or critical items that will prevent a flight from being operational that cause minimal fuel consumption(engines excluded

). I'd say a bracket/holder for a Flight Management System IPAD that gets taken off every flight would put it in that "bracket"

As far as I can see it was 'easily on hand' or it wouldn't have been possible to get it there as 'quickly' as they did.
As mentioned earlier, this was far more likely to be a labor bottleneck than the lack of the part.