The Phantom was the first multiservice aircraft, flying concurrently with the U.S. Navy, Air Force and Marine Corps. Of the 5,057 built in the United States, the U.S. Air Force took delivery of 2,874 aircraft; the Navy and Marine Corps, 1,264; and international customers, a combined total of 919. The Phantom still holds the record for the largest production run of any supersonic fighter built in the United States. The last F-4s in active U.S. operational service were retired in 1996. Yet by the late 1990s, having been upgraded in a number of air forces, more than 1,000 Phantoms still flew worldwide.