My brother sent me a Phoeniz, AZ Facebook Marketplace link to one of these "rare 'Birds" today.
1977-78 Pontiac Firebird Esprit Sky Bird package.
GM knew 30% of Firebird buyers were female, and a 1976 "Blue Bird" show car received lots of interest. School bus manufacturer Blue Bird objected to the name and "Sky Bird" was chosen for production.
According to my
Pontiac Firebird Red Book, the 1977 Sky Bird W50 appearance package was $315 (cloth) or $342 (vinyl) interior and carried two tone paint, color-matched wheels, a light blue Formula steering wheel, Trans Am-style engine turned aluminum dash insets, special decals, and pin striping.
The Sky Bird was followed by the similarly-themed Red Bird at mid-year 1978 and Yellow Bird in 1980.
Production numbers are not available but appear not as high as GM would have hoped. One source estimates 4,000 units for the 1977 Sky Bird, but others surmise that number for all three colors. With 34,000-some 1977 Firebird Esprits made, I doubt more than 10% wore Sky Bird trim.