A note on baggage policies with JetBlue's airline partners
When you are traveling on a single ticket with JetBlue and one of the airline partners above, JetBlue will in most cases honor the free baggage allowance of the partners (when those allowances exceed JetBlue's current policy). However, JetBlue strongly urges you to check the baggage rules of each airline that you plan to travel with.
Any excess baggage charges for extra bags, overweight bags, or oversize bags, are determined by the airline at your point of check-in. See JetBlue's schedule of fees for optional services.