Just got off an Emb 145. No way that koala will fit in the overhead bins in that toy plane. If you can pull it off on the larger jets, you may get to gate check it on the Emb! Stick a luggage tag through its ear and hope for the best? Otherwise, I would stuff it in a box and check it through.
I would have started with a smaller koala smuggled down the pants and worked up to the jumbo.
