Caroline Kennedy, the girl... in front of Caroline, the Kennedy family private twin engine Convair CV-240

the Kennedy family bought the plane in 1959, and donated it to the Smithsonian in 1967

https://www.si.edu/object/sweet-caroline%3Aposts_857e8b644ce623e2d40168e0daaa661a

https://kennedy-photos.blogspot.com/2013/02/page-2.html