Frontier Airlines admits staff get bonus for charging oversized luggage fees
What is Frontier Airlines' personal item size limit?
Carry-On and Personal Item Size Limits for 32 Major Airlines
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18" Personal Item Under Seat Travel Backpack for Frontier, American, Spirit & Southwest Airlines Black - Walmart.com
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Frontier Airlines Elite Status Guide
Pack small or pay up: Frontier is cracking down on carry-on baggage - The Points Guy