Air hockey tables have a smooth playing surface with tiny air holes and a blower motor underneath. The surface must stay flat and unscratched, since dents and warps ruin the air cushion, so transport it carefully and ideally flat.
Pro tip: Transport the table flat when you can, since it protects both the surface and the blower motor mount.
Watch out: Keep the playing surface flat and unscratched, since warps and scratches block the air holes and ruin the game.