It operates as IB3166 on days 1257 with a 340-600, and on day 4 with a 340-200. The return rotation is IB3167.
The flight also operates on day 3 with a 320.
Close.
Day 4 is normally an A34
3 (Iberia don't have A340-200s) and A320s rarely operate the IB3166/7 - when it's not an A340 it's usually an A321. That's also the case on Day 6 (it operates 7 days a week as per my previous post).