This book presents the select proceedings of the Second International Conference on Design and Engineering of Lighter-Than-Air Systems (DELTAs 2024). Exploring various technological disciplines crucial to the design of Lighter-Than-Air (LTA) systems, this book addresses the pivotal role they play in revitalizing airships within the aviation industry. It further offers insights into energy-efficient and next-generation LTA systems and associated enabling technologies on a global scale. The book also covers a diverse array of topics including design and optimization, aerodynamics, structures, materials, energy and propulsion, stability and control, operations, safety and ground handling, defence applications, and novel applications. This publication serves as an invaluable resource for beginners, researchers and professionals alike, who are interested in the advancements of LTA systems.