Vietnam has ordered its major airlines to review the progress of multibillion-dollar agreements signed with Boeing (BA.N), opens new tab and Pratt & Whitney, and explore new import deals with American companies, as Hanoi seeks to strengthen its hand in trade talks with the United States. The directive, issued by the Ministry of Construction on June 5 and reviewed by Reuters on Tuesday, followed a request from the Ministry of Industry and Trade, which is leading Vietnam's efforts to demonstrate to Washington that bilateral trade commitments are being acted upon.