04-04-2018, 02:28 AM
It should only be possible if you apply for special permissions, with each country have a certain % chance of acceptance for the requested flight as IRL unless it's part of an open skies agreement it requires consent from all three governmental bodies before being able to be implemented. Countries/airports with a large amount of 5th freedom traffic like SIN, HKG, NRT would have a higher % than others like canada or the US, which historically have been more restrictive in allowing fifth freedom flights to be operated into the country. This would make the coding more complex though.