Pratt and Whitney receives NASA contract modification

NASA has signed a $36.9m (£22.9m) contract modification to space-shuttle main-engine manufacturer Pratt and Whitney Rocketdyne of Canoga Park, California, to provide continued shuttle main-engine pre-launch and launch support from 1 April through 31 July.

The contract modification also provides two additional options that if exercised, would bring the potential contract amount for all six months to $56m.