[jimworcs]

That is the most feeble defence I have ever heard. It is a FAA obligation of the airline to "do the math". Could a barman sell someone under age a drink because it is not his obligation to "do the math"? That is a ridiculous argument. This customer declared the age of the child to the airline and then asked them to quote a price for the child to travel. The airline gave them a price and accepted their money. At that point, a contract had been formed.

If the airline had made a mistake, which they clearly had, their obligation is, minimally, to put the customer in the position they would have been in if the airline had not made the error. This is not what they did. They chose instead to gouge the customer for over $2,000 and, to rub salt into the wound, refused to refund the amount charged in error. I do not believe any small claims court will find in favour of the airline in these circumstances. I would definitely sue... their conduct is outrageous.