Question: when was air india and indian airlines merged
[{'answer': '26 February 2011', 'provenance': [{'wikipedia_id': '372651', 'title': 'Indian Airlines', 'start_paragraph_id': 15, 'start_character': 3, 'end_paragraph_id': 15, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::History.:Air India merger.\n'}]}, {'provenance': [{'wikipedia_id': '372651', 'title': 'Indian Airlines', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 123, 'bleu_score': 0.659979094505558, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12846196724984373561}, 'section': 'Section::::History.:Air India merger.\n'}]}]