Most airlines have their own set of regulations and rules regarding the number of bags that one is allowed to check-in and carry with them on board. Some of the general rules and regulations to abide by when travelling utilizing major airlines flying from Miami International Airport include the:(identifiy bullet points hence the -) . American Airlines: two free bags checked-in luggage and four bags shall be allowed on board at a fee. The maximum weight for the checked-in baggage is limited to 50 pounds and a maximum size of 62 inches . Delta Airlines: two free bags for checked-in luggage and three bags that can be allowed on the plane at a fee . United Airlines: two free checked-in luggage and three luggage bags for a fee to be carried on board. The maximum weight for the checked-in bags is 50 pounds, and the maximum length should be 62 inches . Southwest Airlines: the first two bags for each passenger is checked-in free of charge, and up two carry-on luggage shall be allowed. However, the maximum dimensions for each carry-on are small at 10 x 16 x 24 inches. There is no limitation in terms of weight.