The only real difference Kevin is that you'll find it hard to fly formations as other aircraft appear to jump around a bit (due to the slower update speed of other players positions). Otherwise no worries. What is your dial-up speed? If you've got 56k you should be able to fly online with a couple of friends without an excess of problems (just shut-down all other processes apart from FS9). However 4 or more players and the lag really starts to show. Also if someone else is hosting rather than you your speed will be better