Stratos 4 (ストラトス・フォー, Sutoratosu Fō?) is an anime series by Studio Fantasia and Bandai Visual, and directed by Takeshi Mori. Originally spanning a 13-episode anime TV series, which premiered across Japan between January 5, 2003 to March 30, 2003, the series was continued onto three OVA-series sequels, the first of which was released on 28 May 2004 and spanned 2-episodes, followed by Stratos 4: Advance, which spanned 6 episodes and was released on 25 March 2005, and Stratos 4: Advance Kanketsu Hen, which was released on 22 September 2006 and spanned 2-episodes, respectively.

The series has been broadcast by the anime satellite television network, Animax, across its respective networks worldwide, including East Asia, Southeast Asia, South Asia, Latin America, and other regions. The original 13-episode television series and its first subsequent two-episode OVA series were licensed for North American distribution by Bandai's distributive unit across the region, Bandai Entertainment.

Source: Wikipedia