Just some additional clarification: If you are applying at a 135 or 121 carrier, you will need to fill out PRIA requests.

If you were an EMPLOYEE of a company, (IE you received a W-2 at the end of the year) and you flew during the course of your PRIMARY duties, (IE you were hired primarily to fly an aircraft or serve as a crewmember on an aircraft), you need to complete a PRIA form and submit it to the airline that you are interviewing with, regardless of the type of operation (61,91,135,121,141)

Whether or not the former employer completes and returns the form is out of your jurisdiction... some companies (flight schools, part 91 operators) aren't great about keeping records, especially beyond a few years.