I know when you travel with a drone on a airplane the batteries have to be dischaged down to 1 bar but does the remote have to be discharged also.

I've flown with my drone internationally and 3 batteries and no one said anything about the batteries.

When I flew some time back was asked not to bring batteries onto plane fully charged, so all including RC were fully discharged first

Good question.  Probably wouldn't hurt to error on safe side and have RC drained down to 33% in case some authority would ask you to turn it on.

One thing I would not do - During takeoff pull RC out, start acting like you are flying plane, and then blurt out:  Oh ____, the battery is dead!  

I flew to Italy with mavic air and no problem at all. Just for your own peace have batteries at 50-75%. Nobody checked mine but i had them all at 75% just to avoid problem.

What about the controller that is what I am asking. Do I need to discharge it also.

I'm in Sweden from us on vacation and remote was fully powered with no issues

Hi, Be aware of the custom's rules for the country of entry and the country of return as some countries where drones are restricted have been known to confiscate them at customs.

The FAA regulations apply for the loose batteries.  However its better to be safe.

BigRoyBoy Posted at 2018-6-12 23:27
What about the controller that is what I am asking. Do I need to discharge it also.

Most airlines have rules and restrictions regarding lipo batteries, but small drone batteries are not a problem and I haven’t seen any case where batteries have been taken off people, I have flown more than 20 times to various countries with sometimes up to 10 batteries and a couple of RC I have never had any questions regarding batteries.
So you will have no problem with RC or batteries.

Just back from trip to Canada which involved international flight from Dublin to Toronto.  Internal flight from Toronto to Calgary.  Internal flight from Vancouver to Toronto and international flight from Toronto to Dublin.  I had a backback with the Mavic Air+2 spare batteries in Lipo case, I also carried a Panasonic camera and Gopro Hero 5 with 2 spare batteries.  Everything was fully charged and I carried it on board.

No issues at all, I did not have to open bag.

HedgeTrimmer Posted at 2018-6-12 20:35
Good question.  Probably wouldn't hurt to error on safe side and have RC drained down to 33% in case some authority would ask you to turn it on.

One thing I would not do - During takeoff pull RC out, start acting like you are flying plane, and then blurt out:  Oh ____, the battery is dead!

i can see the looks now ....lol

You can be more worried about the problems with powerbanks, if any. For example, was controlled in Thailand internal flight! ( restriction is not more, than 32000mAh)

I just  flew from West Palm Beach to Baltimore and then from there to Pittsburgh.
They seen the TSA lock on it bright orange and the FAA registration on the front.
Never asked about batteries which i had in a battery case down to 1 light  or what was in it. But I followed all the southwest airline rules and
had zero issues. I think the TSA lock gave it away knowing they could open it if needed to.
The only time I was asked was on my way back from Pittsburgh but still never had to open it. I think as long as you follow there rules you should have no problems at least from
the airline side.

Just my input.