What makes the Flame-colored Tanager's presence in the US noteworthy?

Answer

It is recorded as a rare visitor primarily in southwestern border states

The Flame-colored Tanager is much less common in the US, usually only being recorded as a rare visitor primarily along the border states in the Southwest, such as Arizona and Texas.

What makes the Flame-colored Tanager's presence in the US noteworthy?
locationhabitatbirddistributiontanager