Yes. The Selected Acquisition Report of the United States Department of Defense states that it is quite significant. This is on slide 7 in the deck we provided to committee members. The Department of Defense says that the operating and required personnel costs associated with the F-35s is higher than the costs associated with the aircraft they are replacing. This information is on page 84 of the report that was published four or five weeks ago. The figures provided indicate a cost for an F-35 of $31,000 per hour compared to $22,000 per hour for an F-16.
On May 3rd, 2012. See this statement in context.