A hot air balloon flight involves a large, fabric envelope filled with heated air, which makes the balloon rise. The air inside the envelope is heated using a burner that burns propane. As the air heats up, it becomes lighter than the cooler air outside, allowing the balloon to ascend. Pilots control the altitude by adjusting the temperature of the air inside the envelope. To descend, they can let the air cool or release some hot air through a vent. Hot air ballooning offers a unique way to experience scenic views from above, often during sunrise or sunset for optimal beauty.