Who once said "Lies, damn lies, and statistics"
This survey must have been dreamed up by someone whoh doesn't have enough to do.
I don't think that punctuality statistics are a "survey" so much as indisputable fact.
So the comparison with Air Zimbabwe is a little pointless, but more than half of flights departing more than 15 minutes late is appaling.
BA may only have half the number of a/c of easy at Gatwick now, but it does still operate much of its schedule to France, Italy and other "strike prone" countries, yet less than 15% of its flights were more than 15 minutes late.
Easy publicly blaming ATC rather than its crew shortage is blatant lying to its passengers and its a shame more haven't caught on to the truth.