If you are flying into the New York metro area this summer, there's a good chance you'll be late. Newark Airport came in last place in MileCards.com's study of summer flight delays. Only 66.5 percent of flights into Newark during the summer months are on time, according to the study. And the rest of the Northeast didn't fare much better. In fact, five of the 10 worst airports for on time summer arrivals are in the region, according to the ranking. The study also found that June typically sees more delays than July or August. MileCards.com analyzed Department of Transportation airport on time arrival data for the last 10 summers to come up with their ranking.See the 10 worst airports for summer arrivals below.