iniBuilds has released the A310 ON THE LINE, making it their third addition to their Airbus product lineup. iniBuilds states this is their "most complex, in-depth simulation to date”.
A300 purchasers receive a 35% discount. Check this short instruction post on their forum for details. Alternatively, if the A310 is your first iniBuilds product, you can get the A300 at a 25% discount. For the full feature list, check the announcement post on their forum.