My flight from DFW to SJO had a scheduled departure time of 10:05 from gate C37. To my surprise, our departure gate was one of the High-C gates that DFW and 
American Airlines collaborated on and installed in 2022. The gates are modern and feature LED screens with flight information, making them easily accessible and readable. I do not know what time the flight started boarding as I did not get a text from the airline and did not take note of when the app notification came through.