Princess Cruises, a unit of Carnival Corporation, has ordered two 3,600-passenger ships to be built at the Fincantieri shipyard in Italy.

Construction of the currently un-named 141,000t ships is expected to cost Carnival €558m ($730m) each, according to

The ships, which are nearly 20% bigger than the shipping line’s largest vessels, are scheduled to enter service in spring 2013 and spring 2014.

The company said all outside cabins will feature balconies, bringing the percentage of balconies on the ships to 80% of all staterooms.

Princess Cruises, which took delivery of three vessels in a 90-day period in 2004, operates a fleet of 17 ships.