Question: where does porter fly out of in toronto
[{'answer': 'Billy Bishop Toronto City Airport', 'provenance': [{'wikipedia_id': '3984646', 'title': 'Porter Airlines', 'start_paragraph_id': 1, 'start_character': 55, 'end_paragraph_id': 1, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Billy Bishop Toronto City Airport on the Toronto Islands'}, {'answer': 'Billy Bishop Toronto City Airport on the Toronto Islands in Toronto , Ontario , Canada'}, {'provenance': [{'wikipedia_id': '3984646', 'title': 'Porter Airlines', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 384, 'bleu_score': 0.9036816878108531, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9341444988039297464}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3984646', 'title': 'Porter Airlines', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Porter Airlines is a regional airline headquartered at Billy Bishop Toronto City Airport on the Toronto Islands in Toronto, Ontario, Canada.', 'Porter Airlines is a regional airline headquartered at Billy Bishop Toronto City Airport on the Toronto Islands in Toronto, Ontario, Canada. Owned by Porter Aviation Holdings, formerly known as REGCO Holdings Inc., Porter operates regularly scheduled flights between Toronto and locations in Canada and the United States using Canadian-built Bombardier Dash-8 Q 400 turboprop aircraft.']}}]}]