A comprehensive in situ and remote sensing data set collected during the HALO–(AC)3 aircraft campaign. - Ehrlich, André; Crewell, Susanne; Herber, Andreas; Klingebiel, Marcus; Lüpkes, Christof; Mech, Mario; Becker, Sebastian; Borrmann, Stephan; Bozem, Heiko; Buschmann, Matthias; Clemen, Hans-Christian; De La Torre Castro, Elena; et al. (Earth System Science Data, 2025)