I traveled delta(they suck), Jetblue(theyre awesome) and United with my Blade CX as my carry on. I even flew it in the terminal afetr a 1 hour delay was announced. The capt. of the plane asked if he could give it a whirl. I told him he could fly mine if I could fly his!! I only flew my CX that day....
ANYWAY, if the battery is removed, then you will have no issue at security, but be careful of the tools you pack in a carry on, some do not pass. Other than that you should have no problem, but I would verify,verify,verify with the airline, but I have had NO problem and I flew right after the NO LIQUIDS fiasco.

Hope this helps and thank you for exposing your nephews to our hobby.

SSRCCPREZ