SANTA ROSA — Commercial airline passenger volume at Charles M. Schulz–Sonoma County Airport rose 1.9 percent in April from a year before, according to the airport's monthly report of passenger volume for its commercial carrier, Horizon Air.

[caption id="attachment_64300" align="alignright" width="195"] Alaska Airlines ticket counter at Charles M. Schulz-Sonoma County Airport[/caption]

Nearly 16,800 passengers flew Horizon that month. With 63,600 trips through April, ridership was up 2.1 percent versus the same period in 2012.

Horizon Air, a subsidiary of Alaska Air Group (NYSE: ALK) offers flights between Santa Rosa and the cities of Portland, Seattle, Los Angeles and San Diego.