A FAIR RUN!!
disco_air I have just read the postings from last year. I would have to say this matter recieved a fair run! Not to say it can't be rediscussed but one wonders what will change with further discussion.
404 Titan, I tend to lean toward your view.
Will give this some more thought.
The question remains, do you consider the interior of the aircraft as a discreet closed environment. If so any enegy expended by birds to support their own wt must altimately be transmitted to the aircraft via the internal air.