Amateur research can be dangerous
All voluntary answer surveys are complete nonsense. No conclusion may be drawn, no percentages deducted. Quantitative surveys must use a legitimate, random sample with numbers of respondents mathematically calculated to give the desired probability - usually +- 3% is desired. There are all sorts of rules regarding the achievement of the random sample - selection of sample, repeat attempts to contact respondent, etc.
What Airservices has done is just amateur hour and can only lead to incorrect conclusions. They will cherry pick the results they want and put percentages against them.
Just like the interactive newspaper surveys!!! 64% of people think such and such is doing the wrong/right thing. Total crap!
Imagine the hours they spent sitting around coming up with the leading questions. At the best of times you can make surveys produce the results you want simply by the wording and positioning of the question/s at worst you get a result that is the exact opposite of reality.