Originally Posted by
BigFlyer
Can I Change the Fare Basis of a Ticket Within the 24-Hour Cancellation Period? ...
Yes, IF available for purchase. But if not available for purchase, No.
And if you cancel the existing ticket, there is no certainty the K inventory will return.
Originally Posted by
BigFlyer
And one more question - if the change is possible, can it be done by Twitter, or do I have to call?
Yes, but as you sure it will be processed in the needed timeframe. I prefer to make sure it is done now vs tommorrow (which could be too late)