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7 kills
Airstrike with a hovering Harrier
The killstreak is unlocked after getting 7 kills in a row or 6 with "Hardline". The Harrier Strike in theory calls in three harrier jets: two to bomb the target location, and the third hovers in place over the selected area. This third plane will attempt to kill enemy targets with its undermounted gun. In most cases the initial airstike is quite poor and the third Harrier can easily be shot down before even entering it's designated area. Once the Harrier is deployed (without being shot down), it can be devastating. Players with the "Cold-Blooded" perk will not be spotted and can run around the map regardless and easily take down the Harrier. The Harrier will fire missiles at any Helicopter that enters the battlefield, even the "Chopper Gunner". This makes a Harrier a firm favorite for most players. Whilst this killstreak is very effective, the sound it makes will most likely deafen most of the players making it easier for you to move round without being noticed.
Strategy
The Harrier Strike is one of the most popular killstreaks in Modern Warfare 2. It's equipped with an airstrike before hand that can clear a small area before the Harrier enters the battlefield. However, the airstrike isn't the priority, it's the Harrier that hovers that does most damage. I have learned from experience not to place the harrier directly over the enemy spawn but put it so it's looking directly at it the spawn this way you will get more kills. The Killstreak is deadly on large maps such as: Wasteland and Derail as it can kill all enemies regardless of what part of the map they are at.
https://callofduty.wikia.com/wiki/Call_of_Duty_Wiki