Identification for flying?

My son is 14 and might be flying to Florida with his running team in a few months. We don’t fly anywhere so we don’t have passports. He would be flying from Massachusetts to Florida so it’s not like he’s leaving the country that he would need a passport. What would we use for him as identification when boarding a... show more My son is 14 and might be flying to Florida with his running team in a few months. We don’t fly anywhere so we don’t have passports. He would be flying from Massachusetts to Florida so it’s not like he’s leaving the country that he would need a passport. What would we use for him as identification when boarding a plane with his teammates?
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