My suggestion to Jo-Ann and Mike would be not to worry so much about position. If people have a larger number, they expect the people with smaller numbers to get in front of them, so the only awkwardness is in the eye of the beholder.
Perhaps it's the layout of the gates at Midway, but the lines are parallel to the windows, meaning it's very easy to simply walk up to the silver posts that mark the area for your "group of five". You shouldn't have to cut through already-standing people. But if you do, simply say, "excuse me" and don't worry about it. They have the larger numbers, they know how the lines work.
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