Airlinee

I feel like this would become bland after 2030 (halfway thru the game) because there are almost no new aircraft for the rest of the game. The only new planes that are basically placeholders. After 2030 it would basically just be ordering all the same new planes all the time and letting it simmer for 20 years. 

I don't now, probably some browser update broke the graphs feature or something. Just happens sometimes. It's an old game with a very small dev team.

Thankfully the 767-200ER, -300, -300ER, and -400ER are produced until the end of the game. It is feasible, though somewhat unrealistic, to replace your older 767s with newer ones. 

I always operate them until the end of the game precisely because there are no good replacements.

That is a solution but not really an "official" solution. A Ryanair 737 vs Turkish 737 definitely don't have the same turnaround times

It's basically the same thing. If you schedule 19hr/day utilization, you will see a negative impact on your on-time service. But if you schedule less utilization, equivalent to increasing turnaround time, you will see better on-time performance and better route reputation. 

It depends on what you want, really. But if you go for the 787, don't get the 787-10. Get the 777-200 instead.