REWARDS - $20,000
Watch the cinematics. You'll get on a bike and you'll have to board the plane via the ramp in the back. Stay to the right of the plane as you go towards it, thus avoiding the cargo that drops. Veer to the left when you get a chance and board the plane. If you need extra speed, lean forward on the bike a bit. Once you get in the plane, a barrel will knock your bike out.
You will need a parachute to eventually get out of the plane. Time your journey to the end of this area, while avoiding the barrels and taking out the crew. Avoid using any guns in here. Keep moving to the front of the plane and kill the last few guys. The last guy is the one with the parachute, so pick it up after you waste him. Plant a satchel charge anywhere on the plane, then walk to the end of the open ramp at the back. Detonate the charge and jump off the plane. You pass the mission as soon as you jump from the plane.