The Directorate General of Civil Aviation appointed panel probing the large-scale disruption in IndiGo’s flight operations is likely to summon the airline’s Chief Executive Officer Pieter Elbers and Chief Operating Officer Isidre Porqueras on Wednesday, news agency PTI reported citing sources. The move comes as the aviation regulator tightens scrutiny over what led to hundreds of flight cancellations and severe inconvenience to passengers across the network.