The laws around this are very complicated but generally airlines are not allowed to operate flights that operate between two non-home countries unless it's part

The laws around this are very complicated but generally airlines are not allowed to operate flights that operate between two non-home countries unless it's part of a larger route that originates in home country. This would be called a 7th freedom flight, and outside of the EU almost no countries have a deal like this. (See https://en.wikipedia.org/wiki/Freedoms_of_the_air https://en.wikipedia.org/wiki/Freedoms_of_the_air )