Iberia Plus has a new double Avios offer for tickets purchased on Iberia.com between April 7-21 and flown April 7-30, 2014.
The offer is valid for flights on Iberia, Iberia Express, Iberia Regional Air Nostrum and Puente Aéreo.
You can access Iberia’s web page for this offer here.
This is one weird offer. There are no terms and conditions to find out how the double Avios is calculated or registration requirement.