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Having started the game 1 week ago, i'm really thankful for the tips here! A few more that i suggest from my experience.

1. Helicopter buildings are not worth the investments in early levels. Flights bring net losses (taking into account resource costs) and they take up valuable airport space. Don't build the terminal H, fuel H, and control centre as they can't be sold.
2. Meteorological office: can't be sold, and must be used in conjunction with resource base H to produce weather items. Again it takes up two 2x2 spaces at airport. Skip it if you have reliable neighbors to send you the items or if you don't mind waiting for bad weather to be over.
3. Powerful oil refinery is a good investment of 10 greenies in early levels. Having ~50 fuel capacity at level 15, +25 is a big bonus. For a player who checks back every 1-2 hours and unable to stagger landing times, a full tank can fly 5x TPs all at once.
4. While guest planes bring in valuable resources, don't upgrade the runway just to accommodate them if you're not flying the upgraded planes yourself. For example I'm skipping runway 3 right now, as i worked on 3-starring the early TP flights and was already at level 17 when building the flight school. Planning to buy jet and runway 4 at level 19 so i can also land delta planes. It's a pity/hassle to refuse guest jets from level 13-18 but it saved me 10000 coins.
5. The game username can be set to let neighbors know what gifts you need. For now my name is exwhy-LL,catly (indicating i need landing lamp and fuel catalyst). A list of shortened names is at (https://www.airportcitygame.com/threads/ac-shortcut-items-with-multi-language-descriptions.21637/).
6. Gifting building items: players are only able to gift building items for their current/pending upgrades.