[David603]

LuckyOne,
The two most important are 1C: Maddox Games and Team Daidolos.
Note: Edited by Fireskull

No my friend,1C: Maddox Games and Team Daidolos.they are still amateurs and over all...they are business mans.

Not so. Oleg Maddox has spent 12 years building WWII flight sims and was an aircraft designer before he started working in the game industry (he designed the Su-26 acrobatic aircraft). If that does not make him an expert I dread to imagine what your requirements are.

Daidalus Team are not working for money (so they are not business men), and are very knowledgeable indeed about aircraft, so while they may not all be experts they at least know what they are doing, and where to go for truly expert advice.