then there should be a console version that lets console gamers play as well. Those would be big numbers, 
Developing a console version is a rather expensive endeavor, though doable. Personally, when I hear of a developer saying that cross platform play is not technically feasible, to me that's just a developer that doesn't want to spend the money to do it. Square Enix has proven that cross platform play is doable when Final Fantasy XI was released over 15 years ago and again with Final Fantasy XIV. However, there are some issues relating to developing for a console and cross platform play.
The game would have to be scaled down to take into account the limitations of the consoles. Yes, the XB1 and PS4 are more technically advanced then previous console generations but there are still limitations that have to be taken into account, especially when the plan is cross platform play. The other stumbling block is some of the console makers (*cough* Microsoft) tend to not be so enthusiastic for some reason about cross platform play for all consoles, and tend to just support cross platform play between their console and PC. Sony tends to be more embracing of the concept and usually do not place any barriers on the developer, unlike Microsoft, which usually wants a lot of money and a lot of restrictions. We had to pay a lot of money to Microsoft when we added cross platform support to the Xbox 360 for Final Fantasy XI and we're still in negotiations with Microsoft to add cross platform support for Final Fantasy XIV.
As I mentioned already, it's also a rather expensive endeavor development wise, since you need to develop three versions of the game, whether the plan it is to have cross platform play or separate servers for each platform. Console players will also be at a disadvantage because of the lag difference, which is why you usually don't see cross platform play between different platforms in first person shooters.
There are many more issues, such as the the popularity (or lack of actually) of flight sim games like Aces High with the console crowd. Arcade type flight sims (like Aces Combat) are far more popular, while flight games that tend to be more on the realistic side aren't as popular.