Harrier Airstrike is one of the two possible Killstreak rewards available for reaching a 7 Killstreak. Once activated, you choose a spot to call in the airstrike, when the airstrike is finished, a hovering jet (Harrier) will fly around the map for a short period of time.
Harriers can be shot down, either with guns or explosive weapons. The Harrier also shoots down any enemy helicopter air support present.
Related ThreadsHarrier strike-overpowered? - last post by @ Jan 13, 2010
Harrier Strike - last post by Fluroclad @ Mar 8, 2010
Harriers - last post by @ Dec 31, 2009
And the glitch strikes again! - last post by @ Mar 3, 2010
harrier question - last post by @ Apr 1, 2010