If your looking for a Good flight sim that works well on Dialup I would suggest Aces High 2. Though it is $15 a month to play it has to be one of the best if not the best WW2 sims out. I have been playing it for around 3 years now and loved it. It's like crack if you can get into a flight sim but be warned it is the closest I have ever come to the feal of flying a real WW2 plane and it can be tricky at first not to meantion you can have your **** handed to you by some of the Aces in the game ....
There are fighters, bombers and a few ground vehicles.
The graphics are being updated from AH1 so some planes look better than others but the should all be updated at some point. Being that the crew at Hitech Creations consists of 8 or so people they have done a great job.
They are currently working on an offshoot of the standard game that is more of a role playing virsion where you would be involved in actual historical missions and the objective would be to get your pilot through the missions successfully and advance. But this off shoot is still in alfa testing so we will wait and see.
AH2 has a free 2 week trial and a free 8 player mode. The arenas are caped at 350 players.. It is playable with a mouse and there are guys that some how manage to actually dog fight with a mouse but I would really recomend a joystick of some type with the twisty stick for rudder control.
Here are a couple screen shots I had handy for a thread I was posting on the AH forum. They are at night no they are a bit dark, they don't have night time in the main arenas because to many people complaned about it
This is one of a Consolidated B-24J Liberator with it's 2 inboard engins on fire.
this is me in a Mitsubishi A6M (Zero) flying over the B-24.
Oh and if your looking for a game for offline play this aint it. It has a few planes that circle around over what ever base your at to give you some target practice but that about it.
Any way I'll stop typing this wall of text and hope you come on over and join in the fun
Here's a link to the website..
http://www.hitechcreations.com/frindex.html