Is it true that UA international airfare for child is 75% of adult fare. I just noticed that the tickets I bought on UA website last month for me and my son (6yrs old), US to Japan, the receipt listed 2 adults. My son has his mileageplus # which has his age recorded. And the tickets has both his mileageplus# and mine. I don't know why the UA booking system didn't recognize this.

Do you suggest to call the UA to get the discount (I guess around $100) for my son's ticket?