That would seem logical, however case studies seem to indicate pilots etc typically jump to incorrect conclusions under the assumption anything appearing to be flying must be physically designed for flight.
Case Studies In Pilot Misperceptions Of "UFOs"
http://www.zip.com.au/~psmith/pilot-ufos.html
On one hand that makes a certain sense... - if the only tool you have is a hammer, just about everything you have to fix looks like a nail.
But... and here's the but...
The difference between a pilots (or airport workers) conclusions and say, the average Joes conclusions, in my mind have to be much more credible. Because THEY HAVE BY NOW SEEN 99% of the things that would possibly confuse a person who had less experience. Alot of things J6P would say "WOW!!" to, your average pilot or airport worker would say "No biggie. It's just a flock of iridescent swans" or whatever.
Add to that the fact that these people are, to a great extent, trained to be skeptics.
In the interest of full disclosure, I personally do believe in the phenomena. It is either something unearthly, or our own tech, but no doubt there are things in the sky that do not fit into classical aero tech.
But it remains to be proven.