Never. I have booked domestic and international to and from Colombia to the US. It is always 10%. They say UP TO 25%, but I've never seen more than 10%. It isn't exactly 10%, it'll be like 10.0%-10.05% depending on how the rounding works out for the 10%.
I have to assume the greater-than-10% is for exotic routes that aren't connected to Colombia.
My recent flight redemptions all with routes to/from Colombia: 10.03%, 10.02%, 10.01%.
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BTW, I tested out the note I posted above about changing the payment method for Club LifeMiles. And it is working. So far two e-mails about failed payment after removing the credit card. I got an email that says this:
"We had an issue with the payment of your Plan Individual. Please verify your account information and if necessary, provide a new credit card. Remember that you have
21 days to confirm your payment method, in case we fail to complete this process, your subscription will be automatically cancelled. If you need more information, contact our
Call Center - option 3 or Choose your preference channel in
www.lifemiles.com/contact."
I'm debating as to whether I should add a card or not and let it cancel since I signed up for the Elite credit card which comes with the LifeMiles+ Lite subscription. If I let it cancel will I get some sort of long term black eye on my account for being a bad customer who "violated" a contract?