Cross-country soaring flights provide a natural laboratory to study transport processes emerging from the cou- pling between environmental heterogeneity, individual decision-making, and collective interactions. Trajectories result from an intermittent dynamics alternating between relocation phases (gliding) and localised exploration around atmospheric updrafts (thermals), naturally connecting soaring flight to classical problems in movement ecology and anomalous transport in complex environments. Recent analyses of large GPS datasets suggest non-trivial scaling properties in soaring trajectories, consistent with effective dynamics that go beyond simple transport models. However, several key questions remain open, particularly regarding the precise nature of directional persistence, the influence of flight phases, and the impact of collective behaviour. This internship aims to address these issues through a combination of statistical analysis and theoretical modelling.