NEW DELHI : Aviation regulator the Directorate General of Civil Aviation (DGCA) has warned airlines that as passengers might be facing increased stress due to new procedures which have been instituted to carry on operations in Covid-19 environment, disputes between passengers or with the crew might increase.An increase in cases of unruly or disruptive passengers should be expected, either prior to departure or in-flight, DGCA said in a circular."Such behaviour, in the context of pressures imposed by Covid-19 pandemic, may be less aggressive or intrusive than the normally exhibited unruly behaviour, hence extra attention and steps need to be devoted for the prevention and management of unruly passengers."DGCA directed operators to develop.