This is the 7674th most frequent Japanese word.
千歳空港
New Chitose Airport.
In this sentence, 千歳空港 (Chitose Airport) is used as the subject of the sentence, referring to the geographical location of the airport.
千歳空港は北海道にあります。
Chitose Airport is located in Hokkaido.
Here, 千歳空港 is used to specify the location where an event—a flight delay—occurred.
今朝、千歳空港で飛行機が遅れていました。
This morning at Chitose Airport, a flight was delayed.
In this sentence, 千歳空港 is used to describe the destination inquiring about directions.