Originally Posted by
craigthemif
When providing passenger information, there should be a box "member of Iberia Plus or another loyalty card" or something like that.
The most important thing is to not buy the ticket when logged into Iberia Plus. In my experience, it then becomes a pain to remove your IB+ number and replace it with something else - the system keeps reverting to the original IB+ number.
See that's the thing - at that point in the process, I don't get the option to enter a different loyalty number. I can only add an Iberia Plus number or register for it. I am choosing to pay more for Iberia but may just settle Vueling instead if it's going to be this much of a hassle.