Most airlines require drone and batteries in carry-on an batteries at 60% or less... but not all. Contact your airline.
Several sites have index of info by location. Here’s one to get you started:
Looking for drone laws by U.S. state or by country? On this page, we’ve done our best to lay out drone law links to help you better navigate the UAV industry in your respective U.S. state or country.
I'm now in Chios island. No problem at all for flying from France (via Athens) with a Mavic pro in my suitcase and 3 batteries half-charged with connector protection in my hand luggage.