Skymaster (2006)

Life becomes troublesome when 10-year-old Kalle's newborn sister has a birth defect on her back resembling wings. Only he sees the true miracle of his sister's odd appendages. When she is sent to the renowned Plastic Palace Clinic of cosmetic surgery for an amputation, Kalle sets out on a rescue mission. On the road, he meets Alf, a reclusive mechanic, who agrees to help. Together, they take off in Alf's vintage Cadillac in a race against time through an autumn-colored world of song and dance.

Unfortunately the movie Skymaster is not yet available on HBO Max.