Question: The low cost airline known as Skymark Airlines is headquartered at what airport in Japan?
Sentence (from "Skymark Airlines"): Skymark Airlines Inc. (スカイマーク株式会社 , Sukaimāku Kabushiki-gaisha ) is a low-cost airline headquartered at Haneda Airport in Ōta, Tokyo, Japan, operating scheduled passenger services within Japan.
Relevant evidence: Yes