When you’re acting as your own travel agent, you have to stay on top of things. On domestic flights, infants are not required to have their own seats. But on international flights, they’re charged a percentage of the adult fare. British Airways’ infant fare is 10 percent of the adult fare, when the baby sits on an adult’s lap.
Expedia should have notified you about the failure to ticket your daughter, and simply sending you an email wasn’t enough. A phone call or a follow-up email would have helped. Its system should have been able to detect that you had tried, but failed, to buy a ticket for your baby and that you were about to fly without your daughter’s airfare. Certainly, British Airways could have had a more flexible system, too.
Ultimately, a quick check of your itinerary at least a week before your departure date would have revealed the missing ticket, and then none of this would have happened.
As I reviewed your correspondence, I think you might have benefited from using the phone, email or possibly even social media to fix your problem. An email to the right person at Expedia or British Airways (I list the executives for both on my site at elliott.org/contacts), or perhaps a message sent to either company’s Twitter account, might have led to a quick resolution.
I contacted Expedia on your behalf. The online agency refunded most of the extra cost of spending the night in a hotel and rebooking a new ticket. Expedia also issued $400 in coupons to cover your other costs it couldn’t reimburse.