Question: when was the first airline meal served during a flight
[{'answer': '1919', 'provenance': [{'wikipedia_id': '2396851', 'title': 'Airline meal', 'start_paragraph_id': 4, 'start_character': 93, 'end_paragraph_id': 4, 'end_character': 97, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '2396851', 'title': 'Airline meal', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 220, 'bleu_score': 0.9466178497997021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11713340410148690516}, 'section': 'Section::::History.\n'}]}]