At Gridlock get your lancer out when you first begin the game. If you are a locust you are on the right side to be on.
Go up to the Hammerburst, don't get it though and instead click B and X together at the same time on the stairs facing downwards.
Then you will be on the stairs hovering, then walk to the middle pole in the wide open and shoot like 10 lancer bullets quick to the ground in different areas.
Then double click the button that let's you reload and jam your lancer.
Then in the middle of your lancer being jammed jump down, and if you start shaking then go down go on the white truck, moving up and down at least about 3-5 times.
Stand on the edge of the truck and you will start flying.
The only weapons that work up there are the sniper, Hammer of Dawn, Boomshot and the Bow.