Hello all. As you can see I started a completely new airport following the tutorial and enjoying the game. But I was quickly seeing late flights! So I started an investigation as all CEO’s would do
I have built a very small airport and have only the basic atm. So the only thing happening at turnaround is de-boarding, service round and boarding.
This is the taxi way layout.
This flight is my flight to log some times and to provide as much information as possible.
This is only me providing data and asking for inputs/discussion and help

So let me explain. Even in this small setup that is very basic and should be working.
Even the first flight of the morning that can land a few minutes early ends up leaving late for no apparent reason.
I really do believe it happens because of the in game time moving to quickly, because I feel like the flow of the passengers for check-in and de-boarding and boarding is not to slow or fast, the time is.
ALL TIMES are in-game times.
Plane landed at 05:08.
So 7 min ahead of time.
Taxiing took 20 minutes?. No stops for other traffic - and not long taxi route.
35 Pax arriving
De-boarding started at 05:28
De-boarding Ended 05:54
(If it matters - In real life it took 35 Seconds)
28 Pax Departing
Boarding Started 06:30 (On time)
Boarding ended 07:32
So it took 62 minutes to board 28 people??
(If it matters - In real life it took 2 Minutes and 2 Seconds)
This flight was supposed to depart from gate 07:15
It departed 07:33.
So In my mind the in-game time has to be slower.
Or the other options is that planes and people move faster?