(a) No certificate holder may use the services of any person as an airman unless the person performing those services—

(1) Holds an appropriate and current airman certificate; and

(2) Is qualified, under this chapter, for the operation for which the person is to be used.

(b) A certificate holder may obtain approval to provide a temporary document verifying a flightcrew member's airman certificate and medical certificate privileges under an approved certificate verification plan set forth in the certificate holder's operations specifications. A document provided by the certificate holder may be carried as an airman certificate or medical certificate on flights within the United States for up to 72 hours.