Created an Iberia Plus account and made ten $35 bookings on Friday. When I checked them on iberia.com today, my Iberia Plus number wasn't showing up (72 hour issue or whatever). And I couldn't add my account number through iberia.com. What worked for me was to go to ba.com and enter my number for each flight individually. Took about 15 minutes. Immediately my Iberia Plus number attached to each of my flights on iberia.com.