What is the meaning of "fully paid" in the airline industry? Based on my research it's an adjective and it means "paid for at full face value with no further money due from the stockholder", but I found the following sentence in this link where a poster uses it as a noun. if I have asked the question on the wrong forum, I apologize and please let me know. Thank you.
"WestJet service centre and was told they changed our fully paid for flights to one a day later."