The identities of companies approached by the National Fighter Procurement Secretariat weren't disclosed.
Public Works and Government Services Canada said the manufacturers are being asked "to provide comments on the form and content of this second draft questionnaire, which seeks rough order-of-magnitude price estimates.
"After feedback from the companies is reviewed and incorporated, a final questionnaire will be sent to the companies for completion, as was done for the first questionnaire on the technical capabilities of available fighter aircraft," the agency said.
A questionnaire on industrial benefits to Canadian industry in the selection of an aircraft would be issued later, it said.
The evaluation of the questionnaires is part of the government's Seven-Point Plan for possible replacement of Canadian air force CF-18s. No date for a decision on aircraft replacement has been given.