Starcruiser-The book mentioned by Deltamia is by R.E.G. Davies, a very excellent book on Delta, in it is a photo of the Connie in Delta C&S colors.
Citationjet-I remember that too, but when exactly did Braniff have them and what did they use them for? With the exception of South America, I could imagine the Connie was overkill for much of their system, except possibly DAL
Ottopylit-According to the above mentioned book, Delta C&S existed until Sep55, or for two years after the merger of 53.
The C&S 649s were, I think, purchased for the Chicago and Southern routes to Venezuela, Puerto Rico, Jamaica, Haiti and the Dominican Republic.