Both Basilisk and Espresso identify location names as context patterns (e.g., #東京 "Tokyo", #九州 "Kyushu"), which may be too generic to be characteristic of the domain.
tchai finds context patterns that are highly characteristic, including terms related to transportation (#+格安航空券 "discount plane ticket", #マイレージ "mileage") and accommodation (#+ホテル "hotel").