Gimme an "A"!

As anyone who has flown Southwest Airlines well knows, Southwest doesn't assign seats in advance. Instead, you are assigned a boarding priority when you check in at the airport or online, up to 24 hours before the flight. At the gate, you line up with others in your boarding group, and then when your group is called, you stampede onto the plane looking for anything other than a middle seat. (And if you're one of those rude jerks who max out the carry-on allowance rather than checking your bags like the rest of us, you spend several minutes blocking the aisle so you can stake a claim to space in the overhead compartment and then try to jam your oversized baggage there rather than placing it under the seat where it belongs. But