"エア・ドゥ、4路線から撤退検討" [Air Do considers withdrawal from four routes] (dalam bahasa Jepun). Nihon Keizai Shimbun. 2015-01-16. Dicapai pada 2015-01-19.
"エア・ドゥ、4路線から撤退検討" [Air Do considers withdrawal from four routes] (dalam bahasa Jepun). Nihon Keizai Shimbun. 2015-01-16. Dicapai pada 2015-01-19."エア・ドゥ、4路線から撤退検討" [Air Do considers withdrawal from four routes] (in Japanese).