KFWB

980 AM KFWB was put on the air in Los Angeles, California in 1925 by Sam Warner, the founder of Warner Brothers Studios. However, the "WB" in the call letters did not stand for Warner Brothers as some think--the Department of Commerce assigned the calls sequentially at the same time as KFWA in Ogden, Utah and KFWC in San Bernardino, California. KFWB was an all-News station from 1968 until 2009 when they converted to their current News/Talk format.

The KFWB call letters can be heard signing off in this cartoon produced by Warner Brothers in 1940. It appears at around the 5:25 mark.