Originally Posted by
appleguru
Also, from experience: They charge you 10% of the fare for your currently seated cabin. So if you get a complimentary upgrade to C+ for example, make sure you downgrade to normal economy before calling to add the infant in arms to your ticket. Once you do, you can upgrade again without issue. Have never tried with a paid upgrade, but also might work then too?
This doesn't work. When you upgrade you have to pay to upgrade infant's ticket also.