I guess we could call this an Oil Run? From Houston to Port of Spain, Trinidad via Miami with American Airlines. British Airways flyers would obtain 160TPs on this route. Most travelers would usually this a base to explore Tobago or other islands in the region, although Port of Spain has some interesting places to see.
Most flights are on normal US Domestic Flights with a 2-2 seating. Here is a Trip Report from EWR-DFW on an Airbus 321 from 2019.