I see the Boeing 747 freighter that was converted into an aerial water tanker for firefighting is hard at work in Chile. Popular Mechanics reports:
The Global Supertanker has been operating from Santiago and has relied on a team of local firefighters to fulfill the extraordinary logistics of loading nearly 20,000 gallons of retardant required to fill the eight large pressurized tanks. Each of the tanks hold 200 lbs. of compressed air and can disperse retardant with high pressure.
Since its arrival on Jan. 25, the tanker has performed multiple bombing missions every day while battling low visibility, rough turbulence, and harsh terrain all at very low altitudes.
There's more at the link.
There are a number of video clips on YouTube showing the tanker in action. Here are a selection about how it's going about its job. First, an interview with its owner.
This is how they fill the tanks on the ground, using the high-pressure water systems in fire engines to load 19,200 gallons within 15 minutes.
This is what the plane looks like inside, with its array of tanks for compressed air, water, and fire retardant chemicals.
Here it makes a pass over a ridgeline.
Here's a close-up of a water drop.
And here's a cockpit, pilots-eye view of a drop.