Question: how many aircraft did the us lost in vietnam
[{'answer': 'almost 10,000', 'provenance': [{'wikipedia_id': '686151', 'title': 'List of aircraft losses of the Vietnam War', 'start_paragraph_id': 3, 'start_character': 53, 'end_paragraph_id': 3, 'end_character': 66, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '686151', 'title': 'List of aircraft losses of the Vietnam War', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 533, 'bleu_score': 0.775946733368661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9962685599994354923}, 'section': 'Section::::Abstract.'}]}]