This weekend’s World Cup city sprints in Dusseldorf aren’t supposed to start in the airport. But the American and Canadian ski teams will be cutting it pretty close. Thanks to a strike by Finnair’s flight attendants, the two squads’ sprinters are spending Thursday night in Finland and departing for Germany on Friday—giving the teams a buffer of roughly 24 hours before the start of the races on Saturday. American Andy Newell’s schedule will be even...