On Frontier, you get one free personal item, such as a purse or small backpack, that must fit under the seat in front of you. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) All carry-on bags (larger suitcases that fit in the overhead bin) and checked bags are subject to fees. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) However, the Frontier Airlines World Mastercard primary cardholder receives two free checked bags, and passengers with Elite Gold, Platinum, or Diamond status receive a free carry-on bag.