When did the oldest airline start operations?
{'header': ['Airline', 'ICAO', 'IATA', 'Callsign', 'Commenced operations', 'Fleet size', 'Headquarters'], 'page_title': 'List of airlines of the Philippines', 'page_id': '', 'types': ['text', 'text', 'text', 'text', 'real', 'real', 'text'], 'id': '1-15637071-1', 'section_title': 'Commercial airlines', 'caption': 'Commercial airlines', 'rows': [['AirAsia Zest', 'EZD', 'Z2', 'ZEST', '1995', '11', 'Pasay City'], ['Cebu Pacific', 'CEB', '5J', 'CEBU', '1996', '47', 'Pasay City'], ['Fil-Asian Airways', 'MSE', 'MX', 'FAA', '2008', '1', 'Lapu-Lapu City'], ['PAL Express', 'GAP', '2P', 'AIRPHIL', '1996', '21', 'Pasay City'], ['Philippine Airlines', 'PAL', 'PR', 'PHILIPPINE', '1941', '51', 'Pasay City'], ['Philippines AirAsia', 'AAU', 'PQ', 'COOL RED', '2012', '3', 'Angeles City'], ['Sky Pasada', 'WCC', 'SP', 'PASADA', '2010', '2', 'Pasay City'], ['Spirit of Manila Airlines', 'MNP', 'SM', 'MANILA SKY', '2010', '3', 'Pasay City'], ['Tigerair Philippines', 'SRQ', 'DG', 'SEAIR', '1995', '17', 'Makati City']], 'name': 'table_15637071_1'}