Many carriers won't do this. On one trip to the USA, I needed to change the return BA booking and the web site would not let me do it - because the card was UK and I was not in the UK. Nor could I do it by phone, I had to go to the BA ticket desk at EWR.
This sort of thing is usually stated to be anti money laundering but who knows?
Last edited by PAXboy; 20th Jun 2006 at 20:54.