>The reason becomes apparent when you take a carry on bag

your unreason will become apparent when you check that bag and stroll completely unencumbered through the vast distances twixt curb and plane (x2 departure and arrival)

baggage claim really doesn't take that long, and you can come up with something zen to do for 5 or 10 minutes, make a phone call or two, talk to family or friends. Life is better when you stop inconveniencing yourself and creating a rat race when there isn't one. Let everyone around you fight over the overheads.