NATO Airborne Early Warning aircraft (NAEW), while flying over Hungarian territory Under Operation Deny Flight on April 12, 1993, at 6:35 am., detected unknown tracks South of Banja Luka. Two NATO aircraft, U.S. Air Force F-16s, "Black 03" and "Black 04", of the 526th Fighter Squadron "Black Knights", 86th Fighter Wing based in Aviano, were vectored to the area and intercepted six J-21 Jastreb and two J-22 Orao aircraft who were attacking the "Bratstvo" military factory of Novi Travnik.
In accordance with the UN and NATO rules of engagement, orders to "land or exit the No-Fly Zone or be engaged" were issued twice but both warnings were ignored. While warnings were issued, the violating aircraft dropped bombs over their target. In such circumstances NATO has a "single key," meaning that only one clearance was needed, so the Combined Air Operations Center was immediately able to clear the F-16's to attack.
The Serbian Jastrebs headed northwards, back to their base. At 6:45 a.m., the NATO fighters engaged the planes. Captain Robert G. Wright fired his first AIM-120 AMRAAM, downing the first Jastreb which was flying at some 5,000 feet. The remaining Serbian Jastrebs dropped to a few hundred feet, flying at such a low level to use the mountainous terrain to hide from radar and make their escape back to Udbina. Capt. Wright pressed on, closing to within AIM-9 Sidewinder range. He fired two of his heat-seeking Sidewinder missiles, and they were seen to impact with the Serbian aircraft.
With his missiles all hitting their target but exhausted and low on fuel, Capt. Wright now handed over the chase to his wingman, Capt. Scott F. "Zulu" O'Grady, who had been flying top cover to his flight lead.
O'Grady dropped down to engage and fired a AIM-9M but it did not lock-on and missed. Black flight was now approaching "bingo fuel", the point at which a plane will not have enough fuel to return, so they pulled off to refuel from a KC-135 Stratotanker circling in orbit over the Adriatic. At the same time another pair of 526th Fighter Squadron F-16Cs, "Knight 25" and "Knight 26", had been vectored to the area and took over the intercept by the AWACS. At 6:50 am, "Knight 25" managed to get in behind the remaining 3 Jastrebs. He launched a Sidewinder, downing another Serb J-21 Jastreb.
By now the Serbs were close to the international border and the F-16s had to break off the pursuit because the NATO was not empowered to engage aircraft outside Bosnian airspace. The remaining aircraft ware able to land at Udbina Air Base in the Republic of Serbian Krajina in Croatia.
The USAF officially credited three kills to Captain Robert Gordon "Wilbur" Wright, flying F-16C-40 #89-2137/RS, using an AIM-120 AMRAAM and two AIM-9 Sidewinders; and one kill using an AIM-9 Sidewinder to Captain Stephen L. "Yogi" Allen flying F-16C-40 #89-2009/RS of the same unit.
The Serbian pilots involved were: