"In all honesty, I hate how people scramble to board planes, but if you're on a full flight and are trying to make a tight connection with a carry-on suitcase,  plan ahead. You'll want to line up early to ensure your bag fits in the overhead compartment. I've been on several flights where the plane has run out of overhead bin space and the staff started putting bags in the hold below. It's usually not a big deal, but it can be a nightmare when you have a tight connection."