Swissport, dnata, Worldwide Flight Services and Menzies, which oversee more than 90% of cargo handling at UK airports, have written to Chancellor of the Exchequer Rishi Sunak, warning that the ground handling industry is close to collapse.
Menzies Aviation has halved its global workforce, laying off 17,500 staff.
International Consolidated Airlines Group's (IAG) cash costs run at around €60m (S65m) a day.
Airbus, Heathrow Airport and Rolls-Royce have called on the UK government to provide financial assistance to Virgin Atlantic Airways.
Scandinavian Airlines, the flag carrier for Norway, Denmark and Sweden, is to receive financial assistance from the governments of all three nations. Denmark and Sweden have each pledged $300m, while the carrier is set to benefit from a quarter of Norway's 6bn krone ($582m) industry-wide rescue package.
Delta Air Lines, the world's largest carrier by revenue, has had its credit rating downgraded to junk' status by Standard & Poor's. The carrier is understood to have stored more than 600 airliners due to COVID-19.
Rather than lay off parts of its workforce, KLM has reduced the hours of all staff in what its chief executive, Pieter Elbers, describes as "a more balanced approach."