Here are some clues:
* The beginning of the story: It opens with the narrator crashing his plane in the Sahara Desert.
* His skills: He draws, indicating a potential interest in art. He also repairs his plane, showing mechanical ability.
* His experiences: He encounters the Little Prince, a fantastical being, suggesting a sense of wonder and a possible history of adventure.
While the narrator's profession is not stated outright, the evidence strongly points towards him being a pilot. This fits with the story's themes of travel, imagination, and the search for meaning in a vast and often indifferent world.