Low Earth Orbit (LEO) satellite systems are emerging as a transformative solution for achieving global connectivity and addressing the growing demand for high-speed, low-latency communication. This paper explores the potential of LEO satellites in the context of 5G-A networks, focusing on their ability to provide seamless, wide-area coverage, particularly in remote, rural, and underserved regions. We discuss the technical challenges inherent in LEO systems, including satellite constellations design, inter-satellite communication, handover management, and orbit management. The paper also examines how LEO satellites can complement terrestrial 5G-A infrastructure, leveraging hybrid network architectures to offer ultra-reliable and low-latency communication services. Additionally, we explore key use cases such as Internet of Things (IoT), global broadband, and autonomous vehicle connectivity. Finally, we analyze the regulatory and spectrum management issues that need to be addressed for the successful deployment of LEO-based 5G-A systems, ensuring sustainable and efficient global connectivity.