$19,000 per hour flight cost doesn't slow down use of specially equipped jet fighting California wildfire.

An expensive tool is being used to fight the flames of the "Buck" wildfire burning in Riverside County, California.

A specially equipped DC-10 jet has been dropping fire retardant in the path of the flames.

Firefighters say it's critical for containing the Buck Fire, which began Tuesday as a result of a lightning strike.

It costs approximately $19,000 dollars an hour to fly the huge airplane.