Coast Guard Petty Officer Bobby Nash said Saturday the search for Capt. Nicholas Giglio has expanded to about 4,000 square miles. Coast Guard units from four states are involved.
Authorities said there were reports of an oil slick and debris after the crash, but no signals were received from emergency beacons on the plane or pilot.
The pilot of the other jet was able to land his damaged plane after the Thursday night collision. He was not injured and has returned to Shaw Air Force Base in Sumter.