Before you start Reach.....just how many aircraft have been deployed compared to the size of the fleet? The vast majority of the aircraft remain at home in peace time settings and fly a peace time training routine vice being deployed to combat operations in the field.
A more interesting readiness number would that of the deployed aircraft and units. Are the spares and needed manpower getting to them in order to keep that capability near maximum.
The troops in the field depend upon that support thus the units/aircraft engaged in combat operations needs to be fully supported less the needed support not be there and thus causing bad things to happen to those guys on the ground that need that support.
One recent event stands out in my mind that might suggest there might be a problem in that regard. Either too few aircraft are there to meet operational demands or there were not enough aircraft serviceable thus causing a shortage. If the folks doing the work don't have the sufficient number of tools, spares, aircraft and people....a shortage of serviceable aircraft is the result.
Over fly the ability of the engineers to maintain the aircraft and you might will find yourself without enough aircraft each day. I have seen that first hand expecially when combat damage from groundfire and AA weapons starts adding to the problem.