I agree with George. However, in the P section, reference is made to the Airline Coupe also being available on the N and K models. There were seven N-type Airlines made, but aside from the home-made Airline on a spare K2 chassis (now back in the UK), I am unaware of any factory produced K-type Airlines.
If anyone cares to dispute this, I would be most anxious to hear.
You are probably right and I may have got carried away having only slight knowledge of the K2 Airline. The only point I was trying to get across was that the Airline body looked better on the wider chassis (a personal opinion).