This paper provides a comprehensive analysis of the Ground-Based Augmentation System (GBAS) as a modern alternative and supplement to traditional Instrument Landing Systems (ILS). It explores the architecture and operating principles of GBAS, focusing on its ability to enhance positioning accuracy to sub-meter levels, provide flexible approach trajectories, and reduce airport infrastructure maintenance costs. Given that Frankfurt Airport was the first airport in Europe to implement the GBAS system in its landing approach procedures, this article presents an analysis of GBAS data for that airport. Utilizing operational data from Frankfurt Airport spanning 2014–2024, the study evaluates the adoption rates of GBAS-equipped aircraft (increasing from 4.1% to 9.4%) and the actual operational utilization of the system (growing from 4.15% to 21.89%). Furthermore, the environmental benefits of Continuous Descent Approaches (CDA) enabled by GBAS are quantified, including fuel savings of 50–150 kg per approach, reduced noise levels, and lowered emissions, alongside the system's impact on airspace capacity and delay reduction. Finally, the article highlights the primary legislative, financial, and certification challenges (GAST D/CAT III) currently hindering global fleet-wide implementation.