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It depends on what follows instructors.
Plural
Your parents met with your instructors.
Possessive Plural
Your instructors' expectations included that every student will succeed.
Yes, associate instructors are indeed considered faculty members.
In 2011 the DSA records 47000 Approved Driving Instructors.
Yes, riding instructors teach people how to take care of and how to ride horses.
United Diving Instructors's motto is 'The New Way to the Diving Instructor'.