(Portland, OR) -- Spring break at Portland International Airport starts on Friday. Eight-hundred-20-thousand travelers are expected to move through the airport through Sunday, April 6th. Travel is expected to be slightly higher than last year. Monday March 31st and Friday, April 4th are expected to be the busiest days. Security lines could be long, so they're advising travelers to arrive two hours before their flight. Parking is also anticipated to be full. You can check parking lot levels at Fly PDX dot com.