it would go on my iPad as a back up if only they released a version for the iPad.
As you know PocketFMS isn't available on the iPad, but there is a PocketFMS Airspace Avoid app available for the iPad. It is not near as advanced as the PocketFMS PC system (and probably not much use to you for planning), but it does act as a simple airspace warning tool. You can see your position relative to the airspace around you and get warnings if you are about to enter controlled airpsace along with the frequency needed to gain a clearance. You can enter a simple one leg flight plan.
AirspaceAVOID - Can you afford to fly without?
The cost is about £11stg.
It's also available on the Android operating system.
dp