In the "Flight Path" prep mission for part of Act 3 of the Doomsday Heist you need to go to a certain location and identify a target. Lester will send a picture of the target to your messages. Either way he will be marked so you don't have to worry about it.
When you reach the location, the target will leave the area and walk away. Follow the target until he reaches a secluded area and then take him out using a suppressed weapon from a distance.
After taking him out, get his briefcase and bring it back to the facility to complete this prep mission.
Once the briefcase is delivered, the "Flight Path" prep mission is successfully concluded. You can now prepare for Setup 3 – Barrage or review the main Act 3 Hub page.
