Last summer, I traveled by air with my
Mavic Air 2. I took three batteries for it, as well as twenty-four AA Ni-MH batteries and eight 18650 Ni-MH batteries. All were in my carry-on.
I had checked the
FAA's PackSafe for Passengers Webpage. Per my read of this page, the Ni-MH batteries could have gone in my checked luggage, but
the drone's lithium batteries needed to be in my carry on.
Each battery for my
Mavic Air 2 has a capacity of just under 40.5 Watt-hours, according to the labels. Per the FAA Website, this capacity puts these batteries into the 100Wh-or-less-category. For this category, you can carry any number of batteries, as long as they are for your own use: "
Quantity limits: None for most batteries — but batteries must be for use by the passenger. Batteries carried for further sale or distribution (vendor samples, etc.) are prohibited. There is a limit of two spare batteries per person for the larger lithium ion batteries described above (101–160 watt hours per battery)." Your
MA2 batteries are not in this larger category, so not subject to the limit of two.
While checking in for my flight, I confirmed with my airline's counter agents that my arrangement was acceptable. The airline was not JetBlue, but I'd bet that nearly all commerical aviation in the U.S follows FAA guidlines in regard to passengers' batteries. I think a phone call to JetBlue is likely to get you a pointer to the FAA Website, a rote recitation of this Website's information, or something similar.
The response above mine seems snarky and content-free. Poor show, especially from a moderator?