monday's crash involving a boeing 737-800 now grounded by china eastern airlines. the dual engine jet a workhorse, thousands flying around the world, not the embattled 737 max that shook boeing to its core. >> any accident hurts the entire industry, but a boeing accident particularly at this time. >> reporter: boeing is in contact with the u.s. national transportation safety board, and our technical experts are prepared to assist with the investigation led by china's civil aviation administration. experts say information sharing could be extremely difficult. for the already troubled u.s./china relationship, this crash could not come at a worse time. for the families of 123 passenger and 9 crew members, closure may never come. the impact so violent investigators say even identifying remains could be nearly impossible. will ripley, cnn, taipei.