Airlines made unprecedented cuts to flights, costs and staffing on Monday, and stepped up calls for emergency government aid, as coronavirus lockdowns and new travel restrictions hit more major routes.

Already battered shares in British Airways parent IAG, easyJet and Air France-KLM plunged again as they scrapped most of their flights for the coming weeks, joining other major carriers that are all but halting operations in the face of the pandemic.

"It is now clear that the coronavirus is by far the biggest crisis in the history of aviation," Finnair Chief Executive Topi Manner said as the carrier announced a 90 percent capacity reduction and its second profit warning in three weeks.