Airspace Planning Guide
The project to develop an 'airspace capacity & procedure planning guide' basically started by finishing my graduation thesis which concerned the airspace structure and capacity of Amsterdam Airport Schiphol. The topic of airspace got hold of me and I have been working on this guide ever since 2016. Given the comprehensiveness, this project is not envisioned to be finished before 2021/2022.
Image copyright of SkyVector, 2019.