AY99 is still performing on a industry-worst basis. Here are the summarized stats for AY99 for the period 20180415--0615

AY99 lands without any delay a whooping 21% of the time. If "on-time" is defined as "14 minutes or less delayed", the on-time stats jump to 69%. Still 31% of flights, ie once every third day on average, are delayed and on average over one hour. Worst delay in this period was 9,5h delay.

(source: Flightstats)