Get Through the Main Door
"Get Through the Main Door" is a mission objective in the game Alien: Isolation
Activate the 2000-KJVS Generator at the area to the right of Baggage Claim
Go back to the main area (where all the body bags are) and locate the stairs to the left. Climb them and explore the Immigration Office and Security Office.
Exit and locate the Evidence Lock-Up (a gate where a dead man with a wrench is seen behind). Locate the Vent to the right of the gate and crawl through.
Grab the Maintenance Jack from the dead body:
Use the Maintenance Jack to open the Security Braces on the door
Go back to Baggage Claim and open the main door
Axel shows up and there is a cutscene.