I'd been monitoring some Iberia flights for a BA Avios booking over recent days. One interesting "quirk" I noticed that was on some days the web-site showed zero availability for the dates I was interested in, whereas the BA app did show availability. On other days, both the app and web-site showed the availability. Not sure why there should be a difference between web-site and app! In the end I booked today (had to call to do so anyway, as it was a multi-city booking which can't be done online!)