The United States has started to show flexibility on same-country code-sharing, one of the key disputes in the bilateral aviation talks with Japan, Transport Ministry officials said Thursday.The move came on the second day of new high-level civil aviation talks held in Washington. The U.S. side showed certain understanding of the Japanese position to set conditions on same-country code-sharing, which allows two carriers based in the same country to conduct code-sharing operations on one route, the officials said."The U.S. appears ready to discuss setting certain restrictions (on the same-country code-sharing), such as capping the number of flights and limiting the combinations of airlines," an official said. Negotiators are holding the vice ministerial-level meeting in an effort to increase aviation services in the trans-Pacific market.