By Tim Hepher BRUSSELS (Reuters) – European airlines and airports, reeling from delays that caused widespread disruption as demand roared back after COVID-19, are counting the cost of efforts to avoid a repeat next summer. Industry leaders meeting at the headquarters of air traffic control agency Eurocontrol sparred on Wednesday over who was to blame for the chaos that upset passengers and politicians. “We found ourselves more in the news than we would have wished over the summer,” Olivier Jankovec, director general of airports association ACI Europe, told a Eurocontrol conference. Labour or p…