I'm sure you mean EI, and if so, I doubt they would be the ones to leave. They are too intertwined with BA and generate too much revenue from the AA transatlantic codeshares. There is minimal cost to EI in being in OW. Also, I'm curious to know what you consider 'redundant' routes? They have a loss-making short haul route in to Europe, as have BA, but it would appear that they have been more aggressive than BA in maximizing their aircraft usage and bringing down fares. The only reason I could see them departing OW would be if they were to give up the full service model and take on Ryanair as a low cost carrier. Unlikely.