Altho the U-2 was more than a little tricky to land on a big strip, some U-2s actually operated from aircraft carriers.  There was a standard carrier kit  including cable guards and a tail hook that could be installed for a carrier operation.  Some even had folding wings.  Spoilers had to be added to enable lift dumping and the required spot landings.  The U-2 flew on and off a number of carriers, including the Kitty Hawk, Ranger, and America, and flew operational sorties at least once, monitoring French nuclear tests in the South Pacific.

http://www.rbogash.com/U-2/U-2.html
Tom