Not too late for more Shuttle flights

In message
OM wrote:

On Thu, 11 Mar 2010 16:31:11 -0500, "Greg D. Moore \(Strider\)"
wrote:

Donatello has not flown and is not scheduled to fly.

...What's the story on this?

During station construction the flight rate didn't really need three,
but once it was finished most visiting shuttles would have carried one
so the extra gave space in the processing schedule.

Anthony