Iberia has this delivery schedule for the 16 A350-900s that has ordered:
Iberia's capacity growth to 2020 will be driven by higher growth on Iberia's long haul network.
Iberia projected aircraft delivery dates at 24-Sep-2015. Source: CAPA
To facilitate this, in Aug/2015 IAG ordered 3 additional A330-200 aircraft for growth and 8 A350-900 aircraft as replacement capacity for Iberia through the exercise of previously negotiated options with Airbus.
Based on the article “Iberia: the Futuro looks bright for IAG's star pupil as its confidence and growth are transformed” published in CAPA