Above: All emblems from chapter 4
Emblem 1: As soon as you descend the stairs leading out of the cockpit, turn around to your right. Check under the partially open metal door to find an emblem.
Emblem 2: Once you’re at the rear of the plane, you’ll find yourself in a room (just before the second fight with the gas monster) with a treasure chest on the floor. Check the glass case where all the booze is stored along the right wall to find an emblem. You can also get this after the fight.
Emblem 3: Soon after Hunnigan tells you to “cut through the outdoor market,” there will be a short cutscene involving a monster. Immediately after, look for the first alley on your right and head down it. The first open shop on your right contains an emblem.
Emblem 4: As you search for the three keys in the market, you’ll eventually have to make your way onto the rooftops via a ladder. At the point where Leon must thrown Helena across a gap, look up and to your right to spot an emblem in the distance.