FedEx Corp. has ordered 12 new Boeing 767-300 freighters and 12 new 777F cargo jets from Boeing. The 24 widebody jets are worth $6.6 billion at list prices, though bulk buyers often receive deep discounts. Boeing has not said when the aircraft will be delivered. The 777 freighter has a list price of $339.2 million, while the 767-300 freighter retails for $212.2 million.