The best by far to me would be Battlefield 1942, thats my opinion. If you have the right system it looks really good. Although there is more detail on vessels in Enigma.Ok, so Enigma may not be the FIRST to have ships and planes, but I'm sure it will be the best by far.
For planes to me it is a VERY touchy topic, there are going to be people who want planes, some who dont, and others who just dont care.
Now for the game idea that can be intergated into Enigma, good idea. But how would you play online with someone who dosnt have the other game? It would be very unbalanced if you can get into planes, but since the other person dosnt have the game cannot.
However if they make it so the you must own both games to play on the server, (If you dont have it you have to play with other people who do not have it) then the amount of people in servers will drop rather rapidly.
For the plane idea though im all for it, as a Navy has its pilots, but I think if it is made it should be VERY basic, as planes then would not be close to as easy to fly as a jet plane, controls should be sluggish, wind moves the plane around (Likes it moves the waves) damn thing could break at somepoint because some idiot put the wrong screw into a part. etc/
A plane in that time period during a sea battle would be a difficult thing to fly, and i think should be reflected in that way.