The South Korean air force is getting a major upgrade today with the arrival of its first in-flight refueling tanker.<br />That'll dramatically increase the range of its fighter jets.<br />Yonhap News Agency cites a military official as saying the tanker will arrive at Gimhae Air Base, near Busan, after which it'll be put through numerous tests.<br />Those tests will include attempting to refuel F-15K and KF-16 fighters in the air.<br />The tanker is made by the defense arm of Airbus.<br />And with three more tankers to be added to the fleet next year, the total cost is going to be about one-point-three billion U.S. dollars.<br />Right now, South Korea's fighter jets can operate for only a matter of minutes on one tank of fuel, but a refuel from one of the new plans will allow them to operate for over an hour. <br />