a few more questions and i think i might fully understnad this...
what is the difference between AE and SIM2?
when do the aircraft get added? im guessing when they appeared in real world, but dont know, and how long does the game last?
and how long is a "day"?
Please read the manual/wiki, you can find the link in this thread.
There are currently 2 versions of AE running simultaneously, referred to as sim1 and sim2. You can log in by choosing "management sim" -> login from the menu above. Scroll down for sim2 login.
In sim1, one month in a game equals one day in real time (game month has only 24 days). Sim2 is a test game for new features and it is currently running at 4 times normal so that testing would be faster.
Aircraft gets added (in sim2) when they appeared in real life. There was a list showing the aircraft that will be available, maybe a search could locate it for you.
In the past, a game has usually lasted for about 10 game years.