GIGO
Garbage In Garbage Out.
Which is the least popular?
Well, it depends how you ask the question, or what you count.
"Which airline do you most love to hate" is one measure.
"Which airline do you use the most" is another.
"Which airline flies the most passengers" is yet a third.
All three could be classified as defining popularity, but each would provide totally different results.
Ask yourself each of those questions of, say, Ryanair, Swiss, Turkish and Fly BE. Record your instinctive answers and cherrypick which one you choose to publish. The "survey" headline is meaningless, isn't it?
As it stands it looks as if RYR is the most popular, as I suspect it was the only one most people had any idea about - as that was the only one on the list 90% had used.
Lies, damn lies and statistics.
This isn't even statistics, it's misleading rubbish.