Aviation Network Analysis ( Which Brazilian airport flew in 2018, to more different cities? )

Someone could help me to show Which Brazilian airport flew in 2018 to more different cities?

Link of my code bellow:

https://colab.research.google.com/drive/1tbYHgCe5fVfK3FZG0OEnWJvoJ1CxsdHR#scrollTo=DBiXMeO3WUVd

thx