Originally Posted by
babats
Why would a flight between PBI - ORD attract APD?
It wouldn’t. BA’s website is set up to make the differentiation for APD purposes, but obviously if you want to make a flight that attracts zero APD, say an internal US flight on non-BA metal, I’m fairly certain that BA’s systems are not smart enough to ignore this and just pass the youth as an adult to AA’s systems. That would explain why it works when you try it without the youth element involved.