Adverse weather is the primary cause of delays to air traffic. In this paper models of different maturity level from the United States, Canada and Europe are compared to derive best practices in how to mitigate these impacts. The models are illustrated through case studies in each one of these airspaces. An example in Jacksonville Center in Florida, one for Toronto Airport and one for the Rhein Airspace adjacent to Munich Airport are presented here. Lastly, some of the modeling characteristics are compared to derive best practices and lesson learned that can be leveraged from each other.