Glider aircraft rely on thermals or being towed to gain altitude as they have no engines. The glider soared silently since it doesn't have an engine.
Pro Tip 2/3
Aviation Sport
Flying a glider is popular as a sport and hobby where glider pilots enjoy the challenge of non-powered flight. Many aviation enthusiasts learn to fly a glider for sport.
Pro Tip 3/3
Quiet Flight
Gliders are very quiet compared to other aircraft because they don't have engines, making them less disruptive. We enjoyed the quiet peace as the glider passed overhead.