The airline has been plagued in recent days by fears of bankruptcy as it struggles amid the sluggish economy and its parent company's shares trade under $2.
Frizzell joined AA from Hewlett Packard. He was director of corporate communications for Compaq when it was acquired by H-P in 2002.
At PG&E, he takes the title of VP of corporate relations, as well as CCO, reporting to senior VP/CA Greg Pruett and with oversight of internal and external communications, online communications and advertising.
PG&E, which serves 15 million customers in the Golden State, posted second quarter 2011 revenue of $3.7B.