AVFlyer
As an aside, there's no such thing as "correct" English, beyond that which is generally accepted by those who use it. Pressure groups such as the APS can try to convince us all we should write "British Airways's" in this context, but most of us would look at that and think "nonsense". Therefore it is the prevailing view that is correct, not them. That may of course change in the future.
English is an organic language and no-one - NO-ONE - can tell you hard and fast rules, we have no equivalent of the Academie Francaise, and the OED merely monitor style and use, they do not prescribe or proscribe. Many of them are in any case utterly preposterous, Latin grammar grafted on to a Germanic language. The perfect example is when you are told not to split infinitives. The only reason for this so-called rule is because you can't split infinitives in Latin. In English you can; end of story. I'm not saying it's right, I'm not saying it's wrong. I'm saying you can.
Anyway, moving on....