A Survey on Unmanned Aerial Vehicles (UAVs) Communications: State-of-the-Art, Existing Standards, and Future Directions. - Fabrizio Granelli; Yan-Ping Lu; Qingqing Wu 001; Zhenhui Yuan; Aly Sabri Abdalla; Vuk Marojevic; Yifan Jiang 003; Fatemeh Afghah; Giovanni Geraci; Anandarup Mukherjee; Sabur Baidya; Giovanni Grieco; et al. (IEEE Open J. Commun. Soc., 2026)