Ahhhhhhh....Tree Top Airlines
, aka Texas Trans Air! My father used to fly with them on business all over Texas in the early 60s, mainly on their DC-3s and Convairs, thus the name Tree Top Airlines.
When I returned to Texas in the early 80s, their name had been changed to Texas International. While I was an impovershied college student at the time, I remember taking full advantage of their 'Peanuts Fares' to SAT, AUS, HOU, DFW, MSY, ect.....