Indeed. See my reply to @tetrazine below: it appears that 90% of bumps are voluntary. But per my original comment, the rate of overbooking is quite low, and leg

Indeed. See my reply to @tetrazine below: it appears that 90% of bumps are voluntary. But per my original comment, the rate of overbooking is quite low, and legally eliminating it should not have a big impact on fares.