What each airline actually charges
Every figure here was read from the airline's own page on the date beside it. A carrier with no page here is one whose site refuses automated requests - its figures are not published rather than guessed.
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Allegiant Air Bag Sizes: Carry-On and Personal Item
Allegiant Air's own figures for personal item and carry-on dimensions, checked bag weight and size limits, and what the fees add up to.
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Delta Bag Sizes and Fees: What the Numbers Mean
What Delta's own bag figures mean for a suitcase on your kitchen floor: linear inches, wheels and handles, carry-on limits, and checked bag fees.
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Frontier Airlines Bag Sizes and Fees
Frontier's own figures for personal items, carry-on bags and checked bags, with what the measurements and weight limits mean at the counter and gate.
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JetBlue Bag Fees, Carry-On Sizes and Change Rules
JetBlue's own checked bag fees, overweight and oversize charges, and change and cancellation rules, with what each figure means for a bag on your bed.
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Southwest Airlines Bag Fees and Size Rules
Southwest's own figures for carry-on size, personal items, checked bag weight, linear size, and fees, read from the airline's page on a stated date.