This is the Convair CV-240. You can read all about it here.
It was a workhorse for maybe seven years and then, ta da!
Along came the Convair 880.
“Delta’s modern jet fleet includes the Convair 880 Jetliner…cruises at 615 mph…provides both deluxe first class and jetourist accommodations for 96 passengers. Delta Jets serve the Caribbean and the U.S.A.”
As you can read here, it was a failure.
It’s kind of interesting that I found both these cards on the same day in the same antiques store in downtown Elizabethton TN. Will wonders never cease…