The first serious violation to the no-fly zone came on 28 February 1994, when six Serb J-21 Jastreb jets bombed a Bosnian factory. US Air Force F-16s shot down four of the six Serb jets over Banja Luka.Beale, pp. 2–3 This engagement was the first combat engagement of Operation Deny Flight, and its only significant air-to-air combat engagement. Perhaps more importantly, the Banja Luka incident was also the first combat engagement in the history of NATO.Owen, p. 21 The Serbs acknowledged the loss of a fifth aircraft in the incident.Serbian officially admitted 5 Aircraft lost (Serbian)
