Campaign summary focusing on the meteorological deployments of the research aircraft and key periods of radiosonde launches from the Alliance. Flight comments note the number of cross sections in the ABL, determined from sawtooths between the surface and typically 1,500 m, and the amount of time flying in the surface layer (SL), typically 15–50 m, or in the ABL, typically 50–2,000 m. Text is color coded by science aim: cold-air outbreak development and structure (dark blue), surface fluxes over sea ice (cyan), turbulent structures in orographic flows (purple), and isotope composition (red). Days when the aircraft and ship tracks coincided are shaded light orange. Flight patterns are shown in Fig. 6 and radiosonde locations in Fig. 3.