The number of passengers flying through Santa Rosa’s Charles M. Schulz–Sonoma County Airport in March was up 31.9 percent over last year, according to new figures released Monday, April 10.

Total airline passengers traveling through the airport last month were 30,814, up from 23,572 in February and 23,359 a year before, according to the county of Sonoma, which runs the airport. For the year so far, passengers total 77,413, up from 63,892 in the first quarter of 2016.

American Airlines, which began service from Sonoma to Phoenix in February, reported 3,803 passengers in March and 5,265 so far. The airline’s Santa Rosa load factor — how full the seats were on each plane — was 85 percent.

Allegiant reported 2,016 passengers in February with a load factor of 67 percent, and 5,245 passengers for the year.

In March, Alaska Airlines reported 24,995 passengers with a load factor of 78 percent. For the year, Alaska’s ridership is up 4.7 percent, at 66,903.

In March, there were 249 arrivals and 250 departures.