Seeing how successful the show is, and such geniuses Phineas and Ferb are with their inventions, and how iconic Candace, Dr. Doofenshmirtz, Perry, and Isabella and the Fireside Girls are, I think Danville could be a tourist area.
Related or not, let me know what you guys think those airlines from around the world could be that would fly into the airport of Dwampyverse. It can be real life airlines too.
In the episode "It's a Mud, Mud, Mud, Mud World", Phineas and Ferb (Song sung by Danny Jacob) sing the song "Truck Drivin' Girl", which is a country song that was more kid friendly, and was one of my favorite songs in the show because of the genre. I kind of hope a few, only a few more songs in the show have this genre because I listen to country.