Skip - Whilst noting your point about OpCos, it was quite appropriate for me to explain IAG's market presence at MAN in terms of sub-brands. British Airways is not widely represented at MAN, whilst IAG arguably is. Context is important in this case, and the two terms are not mutually exclusive. Aer Lingus is both an OpCo and a brand. Reference to either term is valid according to circumstance. In my posting, reference to 'brands' [of IAG] was apt.
BTW, you didn't need to explain to me that OpCo is an abbreviation for 'Operating Company', or even what one does. Condescending much? You'll be amazed to learn that some of us are quite familiar with the term. Would you expect me to explain to you what a 'brand' is? I do you the courtesy of presuming you to know this, and would appreciate similar respect in return. You're amongst fellow pros on here. In my case, I've been analysing the airline industry for longer than I care to admit to ... just qualified for my first jab!