Gate checking is always free of charge, and basically means your carry-on will be put into the cargo hold with all the other checked luggage.
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Although some web sites are more forthcoming about bag fees than others, these charges are set by the airline and do not change whether you buy your ticket over the phone or online, through the airline, or through a third party website. The bag charge will be the same.
Gate agents often keep track of the number of passengers who board with carry-on bags that are too large to fit underneath their seats. Planes don't have enough overhead bin space to allow every passenger to bring a carry-on bag, so there has to be a cut-off at some point.
In most cases, you will receive a special tag that you or the gate agent will place on your bag, and the bag will be taken away. In other cases, you may receive the tag and you'll be asked to leave it in a designated area when you board.
The only airline to not charge for checked baggage is Southwest Airlines. All other airlines charge fees to check luggage. Some airlines will permit 1 checked bag for free depending on the fare you purchase.
Winner: Southwest AirlinesSouthwest charges absolutely no bag fees. American, Alaska, Delta and Hawaiian charge $30 for a checked bag, while JetBlue and United charge $35 for the same. Low-cost airlines Spirit and Frontier separate from the pack here, as they charge customers for all overhead carry-on items.