Thanks Buzzard, that's interesting. I had actually convinced mum and Dad to both sign up for accounts and we did all the purchases of miles, booking of flights for both of them through her account.
The only issue now is that means she has to pay the taxes! She missed the call earlier on today
and she couldn't really understand the voicemail. I called back just now and they said the english speaking payment people don't start until 10am Columbian time and they will ring her when they get in - Mum's now off to bed with her phone and credit card next to the bed wondering if she'll get a 1am call!
Interesting with the taxes... online they said it was like $20USD - the itinerary has come through just over $200USD (Mel-Sin-Add-Coo)?? Still waiting on final payment confirmation to feel I can lock it in on the 'successful' thread!