Revealed: The best and worst US airlines for carry-on baggage allowance

All the major US airlines charge for checked luggage on domestic routes — and some also charge for carry-on bags - (Getty/iStock)

Airline Southwest recently ditched the cherished perk of free checked luggage, causing uproar among its customers.

The policy was seen as a key differentiator between the Dallas-based airline and its competitors and means that now, all the major US airlines charge for checked luggage on domestic routes.