FCC Chairman Tom Wheeler said he doesn’t believe AT&T will sit out of the agency’s highly anticipated airwaves auction next year. He pointed to AT&T’s past insistence that it needs more airwaves for its growing mobile business. “I have a hard time envisioning this once-in-a-lifetime opportunity for this kind of beach-front spectrum being something that people throw up their hands and walk away from,” he said Wednesday at meeting of the FCC.