Originally Posted by
davidajeff
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.
You're in the wrong place. It's the page after that where you input your non-Iberia details.
See attached screenshot...