BART passengers generally love Spare the Air Days! To us, it's really like a "passenger appreciation day" when we get free fare for a day or two to make up for all the inconveniences we've experienced for the year. For me, two Spare the Air days save $16 total! These special passenger appreciatoin days put us all in a great mood for a change.
On Spare the Air days, we tend to more easily forgive BART for any delays, over-crowdedness or other mishaps. You just can't complain a whole lot when you're riding for free.