Same with me. Travelled many times with a JetCat in a simple plastic bag as hand carry item, with no questions ever asked. Putting the electronics etc in a ziplock bag is a good idea.
Usually, the electronics get more attention than the motor. Happened twice to me they took dust samples from the ECU and battery looking for explosive residues.
Pay attention with telling it's an R/C engine, some airlines (like Singapore Airlines) lately very clearly state that R/C engines (with a drawing of an OS type of combustion engine) are prohibited. (Don't give them a reason to start a whole discussion with you ! ). Most important is that it doesn't smell overly to kerosene, hence carry the turbine in an open plastic bag so it can get maximally rid of the kero smell.
Other airlines say no to LiPo's nowadays when they are not installed (in fact, they are referring to bare Lipo's and mobile phones etc). I would make sure the battery looks "used", i.e. wrapped in bubble foam and taped, with the wires hanging out.
But basically, you should have no problems.

Nicolas.