Not sure if G2 will run or not... It probably will as I don't see anything about it not running with a Voodoo3, but it may be choppy with that video card and you'll probably have to run at a low resolution and turn all of the extra visuals off (like trees and such). The requirements on the site specify 8MB of video memory so you're ok there with 16MB.

G3 won't run, it requires 32MB of vid memory.

Old Aerofly Pro requires 16MB vid mem so it may work. AFPD requires 64MB so that's a no-go.

What are the rest of your system specs? They may determine weather or not it's worth it, or even possible, to upgrade to a new card.

Todd