Operation Deny Flight was a NATO operation, begun on April 12, 1993, to enforce the United Nations (UN) no-fly zone in Bosnia and Herzegovina. The operation later expanded to providing close air support for UN troops in Bosnia, and carrying out coercive air strikes against targets in Bosnia. Twelve NATO members contributed forces to the operation, and by its end on December 20, 1995, NATO pilots flew 100,420 sorties.
As a part of the operation, the 28 February 1994 air battle over Banja Luka represented the first combat engagement for the NATO forces in history, while during April 1994 NATO aircraft carried out their first ever bombing mission near Goražde in Bosnia. These incidents played an important role in the development of NATO in the post-Cold War era and set a precedent for future NATO operations. However, the Bosnian War continued for more than two years after Deny Flight was initiated and the operation led to several conflicts between the United Nations and NATO, particularly when UN peacekeeping soldiers were taken hostage by the Bosnian Serbs in response to NATO bombings. Despite these setbacks, Deny Flight worked an important role in the course of the Bosnian War, as its operations successfully prevented significant use of air power by either side in the conflict. While the air strikes executed under Deny Flight had only a small impact on the war, they set the precedent for Operation Deliberate Force, a massive NATO bombing campaign in Bosnia that played a key role in putting an end to the war.