Taken from the main page:
Superb graphics at high frame-rates in resolutions up to 1600x1200 and 32 bit color. View screen shots.
Advanced flight modeling of over 50 different aircraft from 6 countries. Fighter, bomber, attack, cargo, carrier, and even jet aircraft are all represented. A wide variety of combat options lets you man tanks, halftracks, flakpanzers, amtracks, amtanks, PT boats, destroyers, cruisers, carriers, coastal batteries, and anti-aircraft guns.
A comprehensive mission planner lets you organize or join other players to accomplish strategic goals.
A fully configurable 3D view system that is unparalleled in the industry.
Force feedback joystick support.
Built-in voice support with AHVOICE.
Built-in flight recorder and film viewer/editor.
Organized special events for the ultimate in team play, strategy, and historical flavor.
Apparently not if there is a number inbalance though, then the number is not as advertised. Maybe for skulls verification HT should put on the AH web page that you are paying for arena access only.