Beautiful bird but note the feather in question has marks of barring, which this bird doesn't show. Jays jave barred feathers though
The US Fish & Wildlife Service has a feather atlas to help people ID North American birds.
It’s not perfect as they may only have feathers from one or two individuals, and like people birds of the same species aren’t all identical. But it’s still a good resource. Plus it has an Identify My Feather feature that’s fun and interesting to use.