Dangerous Minds has posted a number of pictures of Led Zeppelin inside their private plane, The Starship (owned by singer Bobby Sherman and his manager Ward Sylvester). Some of the pictures seem to be new, however a number of them appear in Neal Preston's ebook, Sound and Fury. It is reasonable to assume Preston took all the pictures.
More interestingly, there is a short video taken inside the Starship.
h/t Suzanne at FBO