Originally Posted by
circusboy
How soon can I do this? I don’t suppose I could make the change after check in before take off?
You need have flown at least the first sector of the itinerary to make any changes at historical pricing.
For example, if you were to fly AMS-LHR-LAX, you could make changes to your LHR-LAX as soon as you step off your AMS-LHR flight.