I am planning to travel domestically in the US next month with my daughter who is 5.
In regards to my own identification, I was reviewing this question to confirm that my driver's license would be sufficient ID for myself. And it seems that per the TSA's web site, I'll be fine with that through 2025.
The TSA's web site indicates that they don't require any identification for children under 18 who are flying, but that I should contact the airline to confirm if they have any requirements. We are traveling with Southwest and reviewing their information for children flying, I could not locate anything specific to ID requirements, if any, the airline has for children.
I'm assuming no ID will be required for my daughter based on this lack of information, but is there something I might be missing?