All Omnicharge products can be brought safely onboard planes. The capacity of the Omni Ultimate is 142 Wh, and falls within the Federal Aviation Administration’s safety limit.
For normal batteries, the capacity limit to bring on a plane is 100Wh, and for larger batteries, the limit is 2 batteries between 100Wh and 160Wh with airline approval. Airline approval is not complicated, you normally just need to fill out a form at check-in, that you show at the security check.
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