SANTA ROSA -- Commercial passenger volume at the Charles M. Schulz--Sonoma County Airport increased once again last month, up 11.6 percent from a year before.

There were a total of 21,262 flyers in June, compared to 19,060 during the same month a year earlier.

A total of 105,588 passengers took flights with the airport's sole commercial carrier, Horizon Air, in the first six months of this year. Total volume is up 6.5 percent from that pace in 2012.