This is the first working, self returning two way flying machine in Pocket Edition (1.2.8).

Due to the redstone mechanics being completely different, all conventional Java designs fail so this is the smallest design I have come up with so far.

It works on 4 pushing pistons for each direction and if people want to know I'll post a layer by layer tutorial.

I've created two designed which are essentially flipped, one fits in a small profile whilst having the ability for more blocks to connect to it however the other works as a player carried more easily as the placement of the red stone block is on top.