So, I have been considering the Tubluff Light Rail extension to Tubluff International Airport recently. Tubluff is one of the two cities (along with Alex City) that doesn't have rail access to the airport. I have been thinking about it, but I don't think it will get implemented as I don't want to focus on extensions anymore.
If the Tubluff Light Rail were to get extended to the airport, then Line 1 will be a more feasible option since unlike Line 2, it doesn't have a loop at each end. The most viable option to extend Line 1 to the airport is at the open-air end of the line.