You’ve probably heard about an aircraft that is also called a stealth aircraft. It’s oddly shaped for one simple reason: its shape makes it less visible to radar, sonar, infrared, and other detection methods. What’s more, it allows the aircraft to carry more luggage and consume less fuel.
The aircrafts’ shape was inspired by birds. Predatory birds use this position to increase their flight range and become less visible.
Such aircrafts are too expensive so they aren’t used in civil aviation.