We are arriving LGW on AA via RDU on a upgrade to business. I am also EXP. That should ensure BA lounge access in LGW even though my connection on BA (operated by BG Airways) to CFU is only in economy, booked in V class, should it not?

I am also unsure about the BG Airways return flight, as the return booked via AA system is showing First, class E, but I can find no references to a class E. How does this relate to BA Classes? Is this valid and we have first class seats, or is this some error on the AA side.

It is listing the BA connections as a Airbus Industrie A320(320), but I can find no reference for the seat configuration for this plane, as again I don't know what class it relates to. I booked through AA not BA.

Any guidance or suggestions to make the most of my time in LGW and my connection and selection of seats, would be appreciated.