Dead Air

Dead Air is a campaign. The Survivors must make their way to a runway in hope of catching a plane away from the Infected.

Official description
Guide your team of Survivors out of the downtown core of Newburg's business district, through derelict office floors and still-inhabited cubicles, and out onto the runway of Metro International Airport, where the only thing standing between you and the last plane out of the city is a murderous army of the undead.

Writings on the wall
Several instances on the roof tops of dead often say "help need food" or S.O.S.