Italian defence industry group Finmeccanica said Wednesday its Alenia Aeronautica unit had signed a contract worth about $200 million (138 million euros) to supply Mexico with four tactical transport C-27J aircraft. The first aircraft will be delivered by the end of 2011 and the rest by the end of 2012, Finmeccanica said in a statement. The contract will bring the number of C-27s to 83. The aircraft is already used by American, Italian, Greek, Bulgarian, Lithuanian, Romanian and Moroccan armies, it said.