Metro International Airport

Metro International Airport is the setting for the last three levels of the Dead Air campaign in Left 4 Dead, mainly as the fourth chapter (The third chapter features the entrance and the finale features the runway).

History
Before the Infection, the airport was one of the many ways out of Newburg, but as the Infection started to spread throughout the city, the airport was shut down and converted so that the CEDA and Newburg police could evacuate citizens. By the time the Survivors arrived, the airport was already bombed by the military and completely overrun. The Survivors arrive just in time to watch a plane try to land, but the pilot appears to have become Infected or died and promptly crashed on the runway, causing flaming wreckage and debris to hurtle towards the unsuspecting Survivors.

Having seen what appeared to be their savior die in a most unsavory manner, the Survivors see another airplane to escape in and hold out while it fuels up. The plane itself appears to be modeled on a Lockheed C-130 Hercules and bears Republic of South Korea Air Force tail markings.

Current Status
Metro International Airport is now overrun and has been largely destroyed by multiple plane crashes and repeated military bombings. This is supported by the fact that the military was seen bombing Infected in Left 4 Dead 2 and that the Survivors will occasionally comment that the airport was bombed. Some Infected inevitably got through during the panic, causing the military to abandon all efforts there and employ a "Scorched Earth" policy to Newburg and its airport. A note: it was probably a way to prevent people from flying on an airplane, immune or not, but they didn't know how to distinguish carriers from non-carriers and bombed the airport as a way to prevent the infection from spreading further into the world.