To avoid excess baggage fees, it’s important to adhere to and weight limits. Carry-on bags must fit in the overhead compartment and should not exceed 22" x 14" x 9". Checked bags must stay within 62 inches (linear dimensions) and weigh no more than 50 lbs, with overweight baggage incurring additional fees. Exceeding these limits can lead to costly charges, so measuring and weighing luggage before departure is advisable.