Some thoughts from a new player

[VodkaOnFire]

Essentially it boils down to a 'rent slots and create route'-button on the demand page of the airports?

Hit the nail on the head there, something like that exactly. Saves having to do a lot of juggling and writing down which routes are already done, and which you still need to make. Especially if you're flying to destinations in Asia/China, where there are 10-15 airports in the same countries with huge demands In the very ideal scenario though, the game identifies the MOST popular route though, so: I click "auto-generate route" --> Select PAX/Cargo --> Select Tourists/Business (N/A for Cargo) --> Press OK --> Game creates the best route based on demand for my selection. Button for this could be in the routes screen, and I think it'd help new players, or players with none/very basic understanding of how the demand works. Secondary, the button you're suggesting fits well in the airports demand page.
I don't mind scheduling the flight(s) myself - that's where some of the fun is!

Another idea worth discussing could be making switching between your affiliated/subordinate airlines a little easier, so that you don't have to go the the "home" tab, select "information" and then press a tiny button. Maybe utilise some of the space near the continue/pause button and make airline tabs? At a similar size to the continue button, they might even fit both the name and logo of the airline. On that note, splitting the current display that shows date/finances in two, and having one show economics and the other one just the date might be an idea that'd help fit more info into that bar as well, while not necessarily taking up more screenspace. Apart from displaying your balance and the fuel price, it might be an idea to also display last months profit/loss as well, just for ease of access. Saves having to to check the mail for that every month. If you then want the individual breakdown of each routes profit/loss, you'd still go consult your mail. The two seperate displays could also act as buttons - the finance one taking you to your finance screen/economic overview, and the date one showing you the calendar.

Speaking of the "mail" tab, I think it should be a more prominent/permanent feature. I've noticed that even as I change the settings, I still get messages about things I'm not subscribed to. A way to alleviate that and still get to display all this information with new airliners, airports and so on, making the "mail" tab more of an "Inbox" tab might be a good idea. I wouldn't want you guys to be like every other game, but a game that really handles this well is Football Manager. They have an "Inbox" tab that then contains multiple on-screen tabs with the information being split up into essential and non-essential info basically. It looks something like this http://www.cubed3.com/media/2016/Novembe...017_03.jpg (Main Inbox tab selected on left side, inbox tabs directly above the news/messages). My suggestion would be for the "Inbox" to contain tabs like: All Messages (everything), My Airline (messages for/from my airline, e.g. finance reports, yearly evaluation, fleet deliveries etc.), Aircraft/Manufacturer news, Airport News and eventually the rules/regulations changes and global events like wars, oil crises and what have you. It'd make the ease of use and readability of the messages much more enjoyable and easy to use. Also, obviously, to make sure that the settings work like they are supposed to . With a system like that, you don't even need to be able to delete messages - just have them auto delete once a year unless you choose to save them.