JACKSON, Wyo. (AP) — The Jackson Hole Airport in western Wyoming had its busiest year on record with about 391,000 people boarding commercial flights.

Travelers at the airport near Grand Teton National Park increased by 11 percent last year, surpassing the previous record-holding year of 2017.

The 2018 data shows huge jumps in plane ridership during the area's offseason.

Traffic in November increased by 47 percent year over year. Ridership went up by 36 percent in April and 24 percent in September.

Airport director Jim Elwood says there were major gains in air ridership in the shoulder seasons, likely from Frontier Airlines re-entering the market and American Airlines offering year-round flights.