Maintaining precise altitude during aggressive maneuvers is a significant challenge for fixed-wing UAVs,
particularly in high-speed flight, aerobatic maneuvers, and extreme conditions. These aircraft need to control altitude
during sharp turns, quick climbs and descents, high-G maneuvers, and aerobatic sequences that involve significant
attitude changes and nonlinear aerodynamics. This review looks at the latest control methods for altitude regulation in
these situations.