I probably wouldn’t trust airplane mode, but I do believe power off is safe. There is no transmit capability in off correct?

But yeah, leaving phone at home is best knowing tracking sites like these exist.

Or just hit airplane mode / power off. Or just leave the phone at home, the procedure takes only 5-10 minutes.

People are way to attached to their phones. The world will not collapse in that hour, it is a survivable event, or so I hear from reputable sources.