Question: In commercial aviation, what is the system where in-flight food or beverages are able to be purchases after being issue the document or electronic record by the airline?
{'answer': 'In commercial aviation, buy on board (BoB) is a system where in-flight food or beverages are not included in the ticket price, but are either purchased on board', 'supporting_facts': [['Buy on board', 0], ['Airline ticket', 0]]}