[caption id="attachment_47291" align="alignright" width="300"] Alaska Air currently serves Santa Rosa with Bombardier Q400 turboprop aircraft.[/caption]

SANTA ROSA -- The number of airline passengers going through Charles M. Schulz--Sonoma County Airport in August rose slightly from the month before and was up nearly 10 percent over the year, according to figures released today.

Last month, 20,879 passengers used the airport, a slight increase from the 20,617 who used the airport in July, according to figures from Alaska Airlines, the airport's only commercial carrier. August passenger traffic was up 9.9 percent from August 2011, when about 19,000 passengers used the airport.

For the first eight months of this year, 140,643 passengers used the airport, an increase of 3.3 percent from a year before. That pace was just slightly behind the previous high mark of 141,086 for that time period in 2008. Commercial service returned to the airport in 2007.

Through its subsidiary, Horizon Air, Alaska Airlines operates flights from Santa Rosa to Portland, Seattle, Los Angeles and San Diego.

In June, Alaska Airlines started flights between San Diego and Santa Rosa, replacing service from Sonoma County to Las Vegas.