JetBlue welcomes small cats and dogs in the cabin for a fee (usually around $125 each way). Pets must fit comfortably in an airline-approved carrier that goes under the seat. I called (844) 734-0813 once to confirm carrier dimensions, and the agent helped me reserve a pet slot—there’s a limited number per flight. The combined pet and carrier weight must not exceed 20 lbs. JetBlue even offers 300 TrueBlue points per pet booking, making it both pet-friendly and customer-conscious.