A C-Class Civilian Airship was flying through the endless airspace, heading from south to north.
Airships are divided into four classes: A, B, C, and D.
A-Class and B-Class are military grade and capable of carrying weapons.
C-Class and D-Class are for civilian use. Among them, the former is commonly used for operations such as travel between City No. 10 and City No. 18, the most common high-end mode of transport being the C-Class Airship.
D-Class is for home use and belongs exclusively to the wealthy.
Inside the cabin were four people, one in charge of navigating while the other three frantically cleaned the cabin, even using strong acid detergents in an attempt to erase all traces of blood.
They wore simple full-coverage transparent breathing masks to avoid inhaling toxic gases produced during disinfection.
The cabin had already been cleaned, but they feared the residual DNA wouldn't pass the airspace blockade inspection.
