Question: is a duffle bag considered a carry on frontier?
Answer: Carry-on bag: Your carry-on bag must be able to fit either underneath the seat or in the overhead bin. It cannot be larger than 24"H, 16"W, 10"D (including handles, wheels, and straps) and no heavier than 35 pounds. These are usually large backpacks, duffel bags and small suitcases/wheeled bags!