New update!

This update is mainly balance changes and quality of life improvements, I'll break it all down here. 

- All airports are now randomized, that means, no more going for the exact same airports all the time! You'll need to spread out and find the airport that delivers that, but most likely what will happen is that you'll open more airports that you'll have to manage, adding even more strategy!

- New in game event, Sudden Disinterest! Now if your airport is too popular, it'll undergo a sudden disinterest. This means the popularity rate will always be negative until you're no longer that popular. 

- New upgrade, Popularity +! It raises the cap that will trigger a sudden disinterest will.

- You can now click and drag planes from its airport to another! No more ending route, waiting, then adding to another airport. 

- Removed the plane speed in the plane menu in favor of the profit and the fuel cost. Plus the profit is also shown when you're adding a plane!

- Updated the manual and the tutorial to show this information and updated misinformation. 

Hopefully that'll make the game more interesting than it was. I also want to give a big thanks to @lucylu, for giving me feedback on the game and just playing the game in general, thanks! 

Just a heads up, the game is much harder now, since the popularity cap is here. The easier levels aren't affected as much, but the hard levels are exponentially harder. Also this will probably be the first and last update to the game, unless there is a game breaking bug.