I found a solution which gives a nice result. By observing a script on the network view which send the iPhone input from the device to the computer and setting state synchronization to unreliable, Slerp can be used. The plane should always be rotating in the direction from the last received input. However this will only work nicely if the send rate is set to something low, for instance 5-10 which will assure that the rotation is not updated constantly which will give the "lag".
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