6G for Connected Sky: A Vision for Integrating Terrestrial and Non-Terrestrial Networks. - Mustafa Özger; István Gódor; Anders Nordlöw; Thomas Heyn; Sreekrishna Pandi; Ian Peterson; Alberto Viseras; Jaroslav Holis; Christian Raffelsberger; Andreas Kercek; Bengt Mölleryd; László Toka; et al. (EuCNC/6G Summit, 2023)