I will bring 2 or 3 small suitcases, cos there are not many esclators at JR stations. If I bring big suitcases, it will be too heavy to carry it and walk up the stairs, my kid is too small to help.
Just to share with you, I visited DL website and learnt that the flight has changed to 8:10 am, so we may have to arrive a bit earlier to the airport.