well, i'm sure someone will correct me if i'm wrong, but the current carriers could carry enough to CAP the fleet, including the LPD and LPH's allowing them to offload booties.
Of course, they'd be ridiculously inefficient, as the only Harriers we have left don't have radar, and can't carry anything more than Sidewinder, so would be pretty damn limited.
Then again, its exceptioanlly unlikely we'd be going up against anyone with a credible airforce, current international poliics being what it is, and the ground attack role would be more useful and Gr9's are pretty good at that