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Just from a quick search for just one person on the airfare: you are looking about $400 for airfare (Miami to Oklahoma City... put in dates of 9 July to 13 July just for checking purposes... rates...

Check out flight schedules and rates on sites such as Kayak. In some cases, it can be cheaper to fly than to drive, not to mention much faster. Compare that with the cost of car rental and fuel, not...