I took my first trip with my ePPG. I ground shipped the batteries, and took everything else on the airline with me.
Batteries packed as instructed (discharged, connectors taped, wrapped in bubble-wrap, with a layer of cardboard between each pack):
Clothes and helmet in my carry-on (not pictured), and hoops carried on separately.
Glider and chargers in one piece of checked luggage.
Motor in my second piece of checked “luggage”.
I wrapped the motor in foam and stuffed into a small wheeled trashcan. Even though the trashcan was probably over the size limit (it only weighed 42 lbs), I got lucky both ways and didn’t get charged extra by Delta.
Everything arrived in good condition both ways (although the motor was opened and inspected on both flights).