Race organizers rescheduling pre - race events , hoping to accommodate spectators . Up to 20,000 international runners could be affected by flight cancellations or delays . The 26.2-mile course winds across New York 's five boroughs . Runners unable to reach Manhattan in time for the race will be entered in next year 's marathon .
Race officials rescheduling pre-race events , working to accommodate participants . Up to 20,000 international runners could be affected by flight cancellations or delays . The 26.2-mile course winds across New York 's five boroughs . Runners unable to reach Manhattan in time for the race will be entered in next year 's marathon .