1. Introduction; Part I. Basics of Aerial Access Networks: 2. Aerial integration: from UAVs, HAPs, to satellites; Part II. UAV Communication Networks: 3. UAV serving as flying infrastructures; 4. UAV serving as flying users; Part III. High-altitude Platform Communication Networks: 5. Deployment for high altitude platform systems with perturbation; 6. Cooperative HAP and LEO satellite schemes for data collection and transmission; 7. HAP-reserved communications in space-air-ground integrated networks; Part IV. Satellite Communication Networks; 8. Ultra-dense LEO satellite networks; 9. Ultra-dense LEO satellite constellation design; Part V. Integration of UAVs, HAPs, and Satellites: 10. Integrating terrestrial-satellite networks into 5G and beyond; 11. integrated terrestrial-aerial access networks enables by network slicing.