How long is the flight time from Shikoku to Ronald Reagan Washington National Airport?

What is the approximate flight time between the places Shikoku, the smallest (long and between wide) and least populous (4,141,955 as of 2005) of the four main islands of Japan, located south of Honshū and east of the island of Kyūshū and Ronald Reagan Washington National Airport, the public airport located south of downtown of Washington, D.C., in Arlington County, Virginia?

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I followed this chain of reasoning:

I know from locally stored knowledge that:
33°45'00"N is the latitude of Shikoku ([fact: ["110827077@trueknowledge.com"]])

38°51'08"N is the latitude of Ronald Reagan Washington National Airport ([fact: ["136062569@trueknowledge.com"]])

133°30'00"E is the longitude of Shikoku ([fact: ["110827078@trueknowledge.com"]])

77°02'16"W is the longitude of Ronald Reagan Washington National Airport ([fact: ["136062568@trueknowledge.com"]])

By calculation (generator: ["distance_between3@trueknowledge.com"]) I know that:
11,343.8653066 kilometres is the distance between Shikoku and Ronald Reagan Washington National Airport

By calculation (generator: ["flight_time_between_two_places@trueknowledge.com"]) I know that:
15 hours is the flight time between Shikoku and Ronald Reagan Washington National Airport

I used the following facts to provide this answer:

33°45'00"N is the latitude of Shikoku

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38°51'08"N is the latitude of Ronald Reagan Washington National Airport

agree disagree edit

133°30'00"E is the longitude of Shikoku

agree disagree edit

77°02'16"W is the longitude of Ronald Reagan Washington National Airport

agree disagree edit