A lot of passangers are inside the Airport building but they are safe.
Because around 12 Self Defense Force soldiers are fighting on the airfield and 4 others are inside the building's premium lounge.

After the SDF were actually escorting a very important person to the airport and when the zombies started to attack that person died. Now the SDF soldiers that escorted him are now trying to survive. There is enough food and water in the building the only thing they are concerned about is how long they can survive after they are out of bullets.

-Building Floors-

1st floor; Main Hall where the suvivors are, cafeteria.
2nd floor; premium lounge, radio station.

-Outside-

Airfield that's over run with zombies.