As most others have pointed out, it essentially boils down to whether one travels alone or not. Myself, I'll pick 2A or 2K on the Airbus and any seat on the 747.
I'd say the plural is Airbus
It
would be, if "bus" were a common noun (of the fourth declension). But it is not
. I gotta give you half credit nevertheless
, because, indeed, "Airbii" is
not the plural form for Airbus (on any language/dialect I'm familiar with.
)