The Trinity Airfield is a military compound once dedicated to providing aerial admittance to the Trinity Corporation. Given how the Hangars are empty, and that no Military Barricades are in sight, it can be presumed that Trinity used up all the planes, and the civilians were left to die. It is connected to Delve, one of the three major cities spread around opposite corners of the map. It's status as a formerly militarily occupied area, along with its close proximity to the coast, makes this area attractive to coastals, bandits, and the average survivor resulting in it being one of the most dangerous areas of the game. However, it also permits survivors extremely early access to endgame weaponry.