[caption id="attachment_43320" align="alignnone" width="500"] Horizon Air's planes currently carry passengers between Santa Rosa and West Coast destinations.[/caption]

SANTA ROSA — Commercial air travel at Charles M. Schulz--Sonoma County Airport was greater in March than during the same month in 2013, according to the airport’s monthly passenger report.

Total passenger volume increased 2.7 percent, totaling 17,290. There were 48,635 passengers for the first three months of the year, up 3.9 percent.

Aircraft for the airport’s sole commercial carrier, Horizon Air, flew at 73 percent average capacity during the month. Aircraft were at an average 72 percent capacity for the same month last year.

The airport also released its route-specific data for all of 2013. Flights to and from Seattle were reported at the highest average capacity for the year, followed by Portland, San Diego and Los Angeles.

The carrier, a subsidiary of Alaska Air Group, currently serves those four destinations in the western United States. Sonoma County Airport is also in the early stages of a two year, $53.8 million project to lengthen and realign its two runways to comply with new federal standards.