 The reinforced airframe sees extensive use of titanium alloys , increasing its durability to some 30 years or 6 @,@ 000 service hours , and raising the maximum takeoff weight to 34 @.@ 5 tonnes . Internal fuel capacity was increased by more than 20 % to 11 @.@ 5 tonnes , and could be raised to 14 @.@ 5 tonnes with the addition of drop tanks ; in @-@ flight refueling can also be used to extend missions . 
