The most punctual airline in Europe in August is... drumroll... Tarom! SAS came second:
http://www.flightstats-inc.com/company/ops-reports
The list of 2010 winners are a eyeopener:
http://opsawards.flightstats.com/winners-airlines.html
Ignoring the algorithm to calculate all this CEO eye candy for while, I would assume hitting anything 90+% is plain luck or very bad equipment planning.