Hello I bought three tickets through Trip.com. However, the ticket does not include free baggage. Southwest Airlines has free up to 2 luggage, is it free? We will each carry two luggage. (One 28inch, one 20inch) If I have to pay, how much do I have to pay for one piece of luggage? How much should I pay for two pieces of luggage? Can I carry 20inch luggage onboard?
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