Civil air navigation association CANSO is calling for European contingency funds to be made available to its members to help them deal with the massive financial implications of the closure of European airspace.
CANSO director general Graham Lake says air traffic control providers are losing €25 million ($34 million) a day, which "will have a significant impact on investment decisions for the future if we are not assisted by European emergency funds".
Much of northern Europe's airspace has been shut since 15 April as a result of an Icelanic volcanic eruption.
Lake adds: "For safety reasons, an air traffic control company cannot go bust - any losses we incur will have to be recovered from airlines, the travelling public or the taxpayer.
"Contingency funds at European level exist to help in situations like this. We hope they will be deployed to ensure that jobs and investment in European air traffic control are not cut."