Scheduling website freezes up as masses try to snag COVID vaccine appointments at Portland International Airport Monday Updated 12:40 PM; Many Portland-area residents who became eligible for COVID-19 vaccinations Monday morning after months of patiently waiting their turns encountered a new frustration: A scheduling website that wouldn’t let them book appointments. Leagues of people 16 and older with underlying conditions and frontline workers visited an appointment scheduling website for Portland International Airport’s drive-thru at 9 a.m. Monday, only to discover that the website repeatedly froze up, displayed computer coding instead of appointment times or offered them appointment times but wouldn’t let proceed through the booking process.