Linked from
The 11 pages that link to Aerial firefighting, each with the reason it gives.
WildfireRelated: Aircraft can reach remote fire fronts and support crews on the ground.
AircraftRelated: Aircraft can deliver water or retardant and help survey wildfires.
RotorcraftRelated: Rotorcraft can hover while delivering water or fire retardant to targeted areas.
SeaplaneRelated: Amphibious seaplanes can collect water from lakes and deliver it to fires.
Douglas DC-3Related: Some DC-3 derivatives have been converted to carry firefighting loads.
Mil Mi-8Related: Mi-8s can carry underslung water buckets or other firefighting equipment.