Question: first airline to put the boeing 747 into u.s. domestic service
[{'answer': 'Pan American World Airways', 'provenance': [{'wikipedia_id': '4614', 'title': 'Boeing 747', 'start_paragraph_id': 10, 'start_character': 305, 'end_paragraph_id': 10, 'end_character': 331, 'bleu_score': 1.0, 'section': 'Section::::Development.:Airliner proposal.\n'}]}]