To be fair - it means 85% of delays aren’t due to ATC…
****ty infrastructure, outsourcing, lack of crew, weather.
Is 15% an unusual number? ATC delays into Perth are crazy at the moment (especially in busy days), but then they have to work with a single runway half the time, no high speed taxi-ways, half of the flights have to drag their arses down to ‘D’ to vacate. The infrastructure is terrible - at least in Perth