” ... why they didn’t have an airport firetruck from Peachtree-DeKalb drive south on the northbound lanes to get to the fire with foam.”
Two firetrucks from Hartsfield-Jackson showed up and used foam to extinguish the fire. By then, however, the damage was done.
In good traffic, it would also take at least 20 minutes to go from Hartsfield-Jackson to the scene.