After a record number of passengers served in 2019, the Charles M. Schulz Sonoma County airport is adding four direct flights on existing routes early this year. First, American Airlines is adding a 2nd daily flight to Phoenix Sky Harbor International Airport starting next month. Alaska Airlines will add a 2nd daily flight to San Diego and Orange County starting in March. And United Airlines will add a 2nd daily trip to Denver International Airport, it’s central hub, starting in June. The peak of travel season for the Sonoma County airport will now see a total of 19 daily flights going out. The airport served a record high 488,000 passenger coming and going into Charles M. Schulz.