Definitions
1.nounA person carrying a standard or flag, usually at sporting events and parades, previously on the battlefield.
2.nounA transportation company, such as a shipping or airline company, that is registered in a given state
3.nounA strong supporter of a cause, or perhaps the strongest and most visible supporter of said cause.""Bill was the flag carrier of the movement to improve inner city education.""
4.nounA national airline (typically having the flag, or other national insignia, on the tail)
5.nounAn aircraft carrier serving as a flagship