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?
Sentence (from "Buy on board"): 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, or ordered in advance as an optional extra during or after booking process.
Relevant evidence: Yes