Day 198 - 8:58 PM - Upper District, Bay City Ruins, Pasay City, Metro Manila
Flying over the ruins, Mark and Mei could see a lot further. However, flying had its disadvantages. All they could see from above were exposed locations below, and it would be hard to see things hidden under the rubble. It was disadvantageous for Mark's group to investigate from the sky since they were specifically looking for small clues of where the people of Bay City went.
It was also nighttime, making it harder to see the ground below from the sky due to the darkness.
Mark's group reached Chimetrice's location for more or less a minute. Flying was definitely more convenient in terms of speed. Moving on land would take more time, given how many obstacles were left in the ruins of Bay City.