It's Christmas Eve and a huge blizzard has just shut down Hoover International Airport, threating to ruin holiday plans for all stranded travelers. Snowed in en route to their father's house, two unaccompanied minors, Spencer and his sister, Katherine, are ushered to the airport's UM Room, a holding cell for dozens of stranded, parent-free kids from all over the country. Spencer decides to make a run for freedom. With the airport's peevish Passenger Relations Manager and his lackey and every other airport security guard hot on his trail, a group of UMs help each other flee the clutches of airport authority.