All the way. Every Plevo is approved to be carried on to any flight (with the battery in place) or to be checked (with the battery removed) and complies with all regulations from individual airlines, the Federal Aviation Administration (FAA), Transportation Security Administration (TSA), International Air Transport Association (IATA), and Department of Transportation (DOT), and meets UN/DOT 38.3 requirements.
All PLEVO suitcases have a Nickel ion backup battery located inside the board that complies with all established regulations. It is responsible for feeding the suitcase system when the Lithium ion removable battery is not installed.
In case your airline asks you for more information, here you have all the details about the batteries. You can find the same information in the label attached under your suitcase.
Backup battery - Ni-MH
Input: 5v, 250mAh
Removable battery - Li-ion
Input (Micro): 5V/2A 9V/2A
Input (Type-C): 5V/3A 9V/2A
Output (Type-C): 5V/3A 9V/2A 12V/1.5A
Output (OUT 1): 5V/3A 9V/2A 12V/1.5A
Output (OUT 2): 5V/3A