1. Aircraft are generally the largest spawnable vehicles, so make sure they have plenty of space between them and other vehicles or other static map objects.
2. The coordinates are Width/Height/Length.. make sure height is correct, or the vehicles could be spawning underground.
3. Each object spawner template must have a unique name
ObjectTemplate.create ObjectSpawner CPNAME_GP_64_uppercamp_1
and that name must match the object create line (further down in code)
Object.create CPNAME_GP_64_uppercamp_1