American Airlines charges a fee of $125 per pet to bring your furry friend in the cabin with you. The fee applies to each leg of the journey, so if you’re flying multiple segments, the total cost will increase. Only small cats and dogs are allowed as carry-on pets, and they must be inside a carrier that fits under the seat in front of you. Each passenger is allowed one pet carrier, and it’s important to ensure that the carrier meets American Airlines’ size and weight requirements.
Source: https://www.benjaminfranklinbears.org/forum/general-discussion/7d2b9a06
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