Airline passengers may soon have greater protections for cancelled or delayed flights, but consumer advocates say a proposed scheme does not go far enough.

The federal government has launched public consultation for an aviation consumer protection scheme, which would nationalise standards for what passengers are entitled to if their flight doesn't leave as scheduled.

Under the scheme, a minimum level of assistance would be set in place for what airlines would be required to give affected passengers.

Among the levels of compensation being considered are refunds, access to food or accommodation or a quick re-booking to a similar flight.

A European-style scheme where financial compensation was offered to affected passengers would be unlikely, Transport Minister Catherine King said.

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