HR Bashing
Just for a minute let us consider the other side! Here we have an airline who opened up their recruitment and were inundated with applications, so much so that they closed the process early. There has been talk of 1400/1800/2000 applications, whatever the official number there is a significant amount of work involved in processing these applications one by one. In an ideal world we would love feedback all the time as it is what enables us to grow, change and better ourselves.
As some have posted earlier their "No" letters have that sentence about feedback, frustrating yes but you can either do it or not your choice! How long would it take for you to do 1 questionnaire in comparison to them having to do 1400/1800/2000 letters detailing your process.
Whilst I am sure we have all had run ins/frustrations with HR at our various companies past and present they do have an important and unenviable task to do.
Merely my opinion.