I tend to agree with the other replies, except that if your 1st segment is late and the second flight is on time, it can get tight. Note than even with an early boarding position, if the plane is loading (thirty minutes before departure is typical) and you arrive late, then you will be behind your assigned position many times. It is also good to note that if all is on time, a benefit that early boarders have is the ample availability of overhead bin space. I have observed that on some full flights, the bins are full and a half dozen or more people have to check their roller bag luggage. The luggage does get checked to your final destination, but if I am headed to Love Field, that can add twenty plus minutes to leaving the airport.
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