Originally Posted by corporate-wage-slave

I have just been able to combine 10 avios from BA to Aer Lingus via Iberia. Worked first time.

On the BA site - which has daily open heart surgery - the roll out of Nexus appears to be blocking BA's side of the Iberia+Aer Lingus area (whereas Qatar / Finnair / Netctar are all seemingly OK). I would expect this software to be updated at some point over the next week or so. You need to keep this link handy:
https://www.britishairways.com/trave...club/_gf/en_gb
btt in the above is the Balance Transfer Tool, which is currently de-framed via Nexus as cogently explained by WiSK.

If you go to Iberia, and I'm using the Spanish language site, Mi Iberia Plus / Combinar mis Avios treats Aer Lingus as an "Avios Partner" with no direct reference or branding to Aer Lingus. However if you enter the Aer Lingus number, beginning 308 in "Nombre de usuario" and your password in "Contraseņa" then it all seems to work quite slickly. Which incidentally means that there isn't a problem at the Aer Lingus end, but at the BAEC end.