Question: when did mcdonnell douglas go out of business
[{'answer': 'August 1997', 'provenance': [{'wikipedia_id': '154809', 'title': 'McDonnell Douglas', 'start_paragraph_id': 30, 'start_character': 115, 'end_paragraph_id': 30, 'end_character': 126, 'bleu_score': 1.0, 'section': 'Section::::History.:1990–1997.\n'}]}, {'provenance': [{'wikipedia_id': '154809', 'title': 'McDonnell Douglas', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 399, 'bleu_score': 0.8663834605543851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11993921983258316265}, 'section': 'Section::::History.:1990–1997.\n'}]}]