The U.S. was in three of the world's 20 busiest international airline routes in 2017, according to a air travel intelligence company OAG's "Punctuality League" study.

One of those routes -- New York LaGuardia-Toronto -- was the sixth busiest and was the least punctual of the top 20. The other two U.S. routes in the top 20 were London Heathrow-New York JFK in 12th and Chicago O'Hare-Toronto in 14th.

LaGuardia-Toronto was the busiest international route outside of East Asia with 17,116 frequencies. The route's three operators -- American, Air Canada and WestJet -- recorded a dismal combined on-time performance of 54.24%.

OAG defines on-time flights as those that arrive or depart within 14 minutes of schedule, the same standard used by the U.S. Department of Transportation.

Heathrow-Kennedy had 14,218 frequencies with an on-time performance of 76.42% and O'Hare-Chicago had 13,595 with an on-time rate of 65.96%.

Hong Kong-Taipei was the busiest international route. Airlines flew a combined 29,494 times between Hong Kong and Taipei, arriving on time 70.92% of the time.

Hong Kong-Taipei was one of 11 routes between East Asia cities that made the list. Hong Kong-Shanghai, which is served by six carriers, had the second-worst on-time performance among the 20 busiest routes at 57.79%.

Three U.S. routes were also in OAG's list of the 20 busiest domestic routes in 2017. Los Angeles-San Francisco was flown 34,897 times, placing it seventh. New York LaGuardia-Chicago O'Hare had 29,163 frequencies, 12th most in the world. New York JFK-Los Angeles ranked 15th with 25,258 frequencies.

With 64,991 frequencies, the route between Jeju Island and Seoul's Gimpo Airport in South Korea topped OAG's domestic list.


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