I just bought tickets for my family to fly on Delta. There's were two options for tickets. For a $15 per person per flight fee you can choose your seats when you book the flight. If you choose not to pay this fee you choose your seat when you check in. It explicitly states that families may not sit together. I didn't want to pay $120 additional for the flight so I acknowledged that my family might not sit together. We have a 2 year old and a 4 year old. How likely is it that we couldn't get two sets of two seats together?