Gaza: EI and BA use different CRS systems, they only way they can access each others information is by phone.
I recently had a situation wherby I was on a EI flight from Dublin, which was a BA code-share, I needed to change some connection details, but wasn't able to do this until I had arrived at BHX as there is no BA representation at Dublin and EI coudln't help.
OneWorld really need to catch-up fast. Not alot seems to have happend since Feb 99.
Nick