Seattle-Tacoma International Airport is on track for its busiest year ever, showing a 10 percent increase so far over last year — which was also a record breaker.In 2015, Sea-Tac saw around 43 million passengers, a 13 percent increase over 2014. That year, too, broke records.

There are several factors that could be feeding into this trend, reports King 5 News. “Jet fuel is at its lowest cost since 2010. More people are flying in and out of the Pacific Northwest for business and leisure. Competition between major airlines like Delta and Alaska Airlines has been driving down ticket prices and adding new flights. Airlines like Spirit, Volaris and Xiamen have also added or are adding flights to Sea-Tac,” the report says.

Sea-Tac responded by hiring more staff in customer-service jobs like navigating the airport or getting through security. Over the next five years, the facility will undergo a major infrastructure reboot in its Alaska Airlines north satellite facility. It’s also building a new international arrivals facility to help with the current passenger load and also to be able to grow to see even more international flights.