Grand Theft Auto IV Walkthrough

The game will specifically tell you to wait for the helicopter to land on the pad before attacking anyone in the vicinity. So, when you pull up to the dock on the other side of the helipad and attract the attention of two thugs there, hold off on hurting them. Even though they'll walk towards your car, wait until the helicopter has been grounded for a couple of seconds, and then use your vehicle as your weapon, taking both of these foes out before proceeding.

With the initial two enemies nullified, you can then cross the bridge towards the location of the other group of enemies waiting near the helicopter. Strangely, even gunfire used on their friends might not alert them to your presence, so chances are you can approach them without them knowing you're coming (you could also break out a sniper rifle and thin them out from afar). When you reach them, they'll begin firing on you, and you'll realize that they're equipped with various weapons and that you have little cover to utilize. Take them out quickly, fighting in close quarters with a shotgun and collecting the weapons they drop. Make sure they're all killed before proceeding.

When you finally get to the helicopter and no enemies are left, jump on in and begin flying towards your destination on your HUD, which is Francis International Airport, located on the far east side of the Broker/Dukes island. En route, you should run into no troubles, and getting to the airport should be extremely easy. Landing there can be a bit of a chore, however, because the game asks you to land right next to a building that, if landed too close to, will rip your propellers off and force you to repeat the mission. So, landing is a delicate process, and one that shouldn't be taken lightly. When you land, however, the helicopter will be promptly taken away by some unknown authorities, and you're on your own with another mission under your belt.