Chinas first domestically developed aircraft carrier left its northeastern port of Dalian to begin its maiden sea trials on Sunday (May 13). and amp;nbsp;The unnamed carrier, which and amp;nbsp;was launched in April 2017, is the countrys and amp;nbsp;second aircraft carrier, and is an upgrade to the and amp;ldquo;Liaoning and amp;rdquo;, and amp;nbsp;a refitted Soviet Union-made carrier that that went into service in 2012. and amp;nbsp;Footage Credit: ReutersMusic Credit: Audioblocks Innovation