Iberia Upgrade Question
I've seen some flights that I'm considering buying and as there's a big difference between the different fare classes, I'm looking to buy economy and upgrade.
The flights are on BA metal (but Iberia codes, bookable on an OTA)
Can I upgrade these using either Iberia plus or BA avios. Which one?
And is it possible to upgrade online (automatically), or does it have to be done over the phone?
Thanks for your help.