United Airlines announced on Monday that it will be introducing a new seat map feature to help families with children under 12 find seats together free of charge. The feature will dynamically find available adjacent Economy seats at the time of booking and open up complimentary upgrades to other available seats as needed. The change applies to travelers with standard and basic economy tickets and will be fully in effect next month. United hopes the new feature will make it easier for families to travel together and ensure that children are seated with an adult in their party.