I've never carried LiPo's in a LiPo bag on a flight and I fly a lot with my job, like every six weeks all over the world. I always hand carry LiPo's in my backpack, never checked. I'm not saying i'm right but i've never been told otherwise by an airline. I guess it would not hurt to get a bag anyway. I think the lack of regulation education on the part of the officials is a very good point. Also carrying the relevant rules for each airline is a **** good idea, especially for Delta and American in my case. They cant really argue with their own rules. Well, they could I guess, just takes the wrong sort on the other side of the check-in desk or someone having a bad day. By the way, I may be white but i'm a foreigner and I do get the third degree a lot more than most US citizens, especially by Customs & Border and Homeland. I get that they have a job to do but at least know the answers before throwing out the questions. It's not my job to educate them. My drones are registered at my business address in the US and I now carry the 152 page FAA Rules and Regs with me. I could do without the extra weight but pulling out a laptop to show them a PDF isn't going to work. I'm currently highlighting the important stuff so I can quick reference. However, this brings another problem, some people (in a position of power) don't like being told they are wrong, especially when my passport is the wrong colour, and when they have a badge and a gun I tend to just go with the flow. It basically sucks.