Flight policy determination at roaming

A system, method, node and computer program for determining a flight policy to be applied to an unmanned aerial vehicle, UAV, (10) is described. The UAV (10) is associated with a first UAV-Application Server, UAV-AS, (100) maintaining a flight policy applicable for a geographical service area (150) where the UAV (10) is located. The method comprising the first UAV-AS (100) determining whether the UAV (10) is going to leave the geographical service area (150) towards a second geographical service area (150). If so, determining by the first UAV-AS (100) a flight policy applicable for the second geographical service area (150), wherein that flight policy is maintained by a second UAV-AS (130). The method also comprises that the first UAV-AS (100) instructs the determined flight policy to the UAV (10), before the UAV (10) has entered the second geographical service area (150).