Question: when did the first commercial flight take place
[{'answer': 'January 1 , 1914', 'provenance': [{'wikipedia_id': '1942', 'title': 'Airline', 'start_paragraph_id': 5, 'start_character': 305, 'end_paragraph_id': 5, 'end_character': 321, 'bleu_score': 1.0, 'section': 'Section::::History.:The first airlines.\n'}]}, {'provenance': [{'wikipedia_id': '1942', 'title': 'Airline', 'start_paragraph_id': 5, 'start_character': 53, 'end_paragraph_id': 5, 'end_character': 610, 'bleu_score': 0.8030678091477801, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7904737492559264240}, 'section': 'Section::::History.:The first airlines.\n'}]}]