The busiest domestic route in the US wasn't on the mainland. See the top 10.

• Travel data provider OAG revealed its 2023 list of the top 10 busiest US domestic flight routes.
• An interisland flight in Hawaii took the No. 1 spot after not making the list in 2019.
• Business corridors like those between Los Angeles and San Francisco and New York made the top 10.

Travel data provider OAG recently revealed the busiest domestic flight routes in the US for 2023, based on available airline seats — and a short interisland hop in Hawaii took the top spot.