Follow the president to the conference room. Kill the enemies who will breach the door, pick up their weapon and move out. Continue forth and all of you guys will be tumbled around due to the sudden lost of gravity. In this sequence, you must kill five enemies to unlock the “Flight Attendant” achievement. You can just reload in case you failed to do so. Check out the video below:
You can fire your gun and kill the enemies while airborne. Go downstairs and find the first intel on top of the tabletop.
Continue killing the enemies along the way until you finally rescue Alena. Continue following Sgt. Federov and watch the following scenes.
Follow the commander outside the plane. After jumping over a fallen log, you'll find the last intel in this mission.
Crash Site Intel
Continue following the commander until you engage a large number of hostile forces. Take them out and move from cover to cover.
Continue clearing enemies until you find the president. Open the door and watch the following scenes.