Frontier Airlines' base fare includes only the flight itself and one personal item that fits under the seat, such as a small backpack or purse (up to 18x14x8 inches). Carry-on bags, checked luggage, seat assignments, and onboard refreshments are not included and incur additional fees. Bundles like Economy include a standard seat assignment and no change fees, Premium adds extra legroom seats, and Business includes UpFront Plus seating with a blocked middle seat. For more details or to customize your booking, contact (844)734-0813 or visit flyfrontier.com. This a la carte model allows low base fares but requires paying for extras as needed.