And the world's most punctual airline is...
http://edition.cnn.com/travel/article/most-punctual-airports-and-airlines/index.html
I think that airports which have many destinations by budget Air will be ranked lower. As you know, LCCs has achieved cheap fare by sacrificing many things including punctuation.
To be the most punctual airport, less flight frequency and lower portion of budget Air flight routes will be the key factors.
