(Portland, OR) -- Crews at Portland International Airport are working to keep runways open with freezing rain in the forecast. There were 152 cancellations on Wednesday and 93 cancellations on Thursday. 23 of those cancellations are for the Boeing 737 MAX-9 grounding. Travelers should check with their carrier to make sure a flight is still scheduled. Concession and retail operations at the airport are limited, because of staffing shortages.