Race organizers rescheduling pre - race events , hoping to accommodate spectators . Up to 20,000 international runners could be affected by flight cancellations or delays , but Wittenberg said the organization has `` a number of options to get them into any of our surrounding airports . '' 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 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 .