This is how wiki describes it.
“On September 11, 2001, Handel was on air live when the terrorist attacks on the World Trade Center took place. Most of the Clear Channel FM music stations in Los Angeles switched over to a live feed of Handel’s show as news reports and further attacks unfolded. At that time, Rush Limbaugh’s show normally would follow The Bill Handel Show on KFI. Not only was Limbaugh on a plane heading to a golf tournament that day, but telecommunications systems were also devastated in New York, where his show was based at that time. Handel continued to broadcast for another three hours, taking the place of The Rush Limbaugh Show on most stations in the country (as well as the taped broadcast for Armed Forces Radio overseas).”
Thank you.