Lets see... "11 decks".
8 Wasp-class LHDs*, all in commission.
1 Tarawa-class LHA** in commission.
I only count 9 right now, but in the future we will see:
at least 2 LHA(R) (one of which will replace the last Tarawa-class LHA in 2012), which brings us to 10... but more are planned, "up to 12" (to replace the LHDs as well).
I still don't see 11... and I expect that we will see 9-10 as the real sustained force.
However, 2 of those will be capable of that "22 F-35B" air-wing, and the Wasp-class LHDs are better suited for F-35B ops than the lone remaining Tarawa-class LHA.
* well, 7 to the original design with boilers and the 8th to a modified design using GTs instead.
** Of the 5 built, 1 was sunk as a target in 2006, 1 was sold for scrap in 2009, and 2 are decommissioned (1 in 2009 and designated for "other use" and the other in March 2011 and "in reserve").