This postcard was never mailed.
The big DC-6, dubbed El Conquistador in September 1949, became the backbone of Braniff's South America system with service inaugurated to the continent in June 1948. Later, luxurious DC-6 Sleeper Service was begun on Braniff US domestic service on March 1, 1950, between Chicago and Houston.
I have provided a scan of both front and back. The corners display moderate wear and there is a print dot near the word "Texas." Please ask questions before purchasing.