BioShock Infinite: Monument Island Gateway Walkthrough
Once enter Monument Island Gateway, get ready to attack enemies as they show up while you heading out on the Sky Rails towards the airship. Use your Murders of Crows if you have to (there is a salts in the area if you run out), take cover behind the bean while shooting at them. Once the area is cleared loot the area and proceed.
Take out the enemies in the area and enter the building/tower, go to the room on the left to collect another infusion.
Exit the building and proceed with tutorial, heading to gondola control station. When you get to the station, take out the enemy in the area.
Exit the area and proceed until you get to the place where the second skyrail stops because of the freight blocking the Sky-line. You need to find a way to clear the freight. get to a freight hook near the balcony to continue on the skyrail into the room at the balcony for this item. Check to the right for a lever, pull it and proceed.
You will get to the place where enemies start attacking you, drop down into the platform below and take out the enemies on the balcony. Then get to the skyrail above, when see the sign to ascend the building to reach the Sky-line, dismount on balcony of the building and take cover behind the boxes.
Continue up the stairs, take out the guys by the door and enter the building. Pull the lever ahead to go up, follow the marker to get to the sky-line.
Then board prophet Comstocks zeppelin on the right and get ready for a fight. Clear the area, locate the zeppelin control. Once you are in control room get ready to escape when the airship is about to blows up. Follow onscreen instructions when prompted until you get to the Monument