Originally Posted by
sbiddle
The system won't be offline. It will fail and display this for a number of reasons incl (but not limited to) PNR's that have in some cases been booked by a travel agents and those that include domestic US flights. There are also a number of other scenarios.
You will need to call and get it lodged manually.
the message is
"We're sorry, upgrade requests are temporarily unavailable. Please try again shortly."