It is for attention. The whistles are very distinct and more effective than random yelling. Yelling would just be ignored as someone just making a scene.
One can find an airport in Japan by going on Expedia flight which offer flights to and from Japan. One can also contact the international Japanese airport for more information.
The answer is no they are not armed!
Tokyo Narita International Airport
Tokyo, Japan
There are many airports in Japan. The small airport at Sendai was destroyed but all others are still operating.
Narita Airport (60 KM) from the city to the airport in Japan.
Samurai warriors were the shogun's body guards.
Tokyo, Japan
Haneda Airport is the closest major airport to Yokohama and is essentially just on the outskirts of the city. Haneda primarily serves domestic flights within Japan. Narita International Airport is the closest airport for most international flights to and from Japan. Narita is a little over an hour travel time by car or train from Yokohama.
tokyio
6,409 miles Dallas-Fort Worth International Airport (DFW) to Narita International Airport
Narita Airport (Tokyo)Haneda Airport (Tokyo)Kansai Airport (Osaka)Central Japan Airport (Nagoya)Asahikawa AirportShin-Chitose Airport (Sapporo)Hakodate AirportAomori AirportAkita AirportSendai AirportFukushima AirportNiigata AirportToyama AirportKomatsu Airport (Kanazawa)Okayama AirportHiroshima AirportYonago AirportTakamatsu AirportKitakyushu AirportFukuoka AirportNagasaki AirportKumamoto AirportOita AirportMiyazaki AirportKagoshima AirportNaha Airport (Okinawa)