I have purchased a RT Ticket from SFO to IAD along with two $99 companion tix for my kids using the Barclays Charge Certificate. My SO is traveling the same route with my son using a combination of vouchers and cash.
Now I had a last minute trip for work from SFO to PHL. I am trying to not have to travel back to SFO to only turn around and travel to IAD with my kids, but USAir will not allow me to change my initial reservation as it includes my companion certs.
I get it from a process issue but it does not make sense. USAir gets the money (I am not looking for any refunds), the kids would not be unaccompanied (as they would travel with my SO), and US gets an extra seat to sell.
I know it doesn't seem rational in the short term, but they're looking at the long-term behavior of their customers.
If their restricted tickets aren't actually restricted, then no one will book the flexible tickets. Same reason they restrict changing to an earlier flight (move up), even if that flight isn't going out full.