What term is used for a raptor that is not yet a year old and is capable of flight?

The term used for a raptor that is not yet a year old and is capable of flight is "passage." This term specifically denotes young birds that have fledged but have not yet reached their first birthday. They are typically in the wandering phase of their life, moving away from their birthplace but not yet settled into a breeding territory.

In contrast, "haggard" refers to an adult bird that has been possibly captured in the wild, while "juvenile" is a broader term that can apply to any young bird, not specifically to those capable of flight. "Buteo" is a classification for a genus of birds within the raptor family, not indicative of age or capability of flight. The specific use of "passage" highlights the transitional nature of these young raptors as they embark on their journey towards adulthood and independence.