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.