What happens if you want to deploy some of these shared NATO MPA on an operation that some NATO nations don't want to participate in?
How does NATO square that particular circle with its E-3 component? Genuine question - there must be instances where not all the participating nations agree on the mission at hand, yet I've never heard of a national caveat preventing their deployment.
Of course, the linked article deals with a European rather than a NATO air force. I dare say the former would be harder to countenance for many than the latter, perhaps.