14 CFR § 121.402

Other than the certificate holder, only another certificate holder certificated under this part or a flight training center certificated under part 142 of this chapter is eligible under this subpart to provide flight training, testing, and checking under contract or other arrangement to those persons subject to the requirements of this subpart.

A certificate holder may contract with, or otherwise arrange to use the services of, a training center certificated under part 142 of this chapter to provide training, testing, and checking required by this part only if the training center—

Holds applicable training specifications issued under part 142 of this chapter;

Has facilities, training equipment, and courseware meeting the applicable requirements of part 142 of this chapter;

Has approved curriculums, curriculum segments, and portions of curriculum segments applicable for use in training courses required by this subpart; and

Has sufficient instructors, check pilots, and check flight engineers qualified under the applicable requirements of §§ 121.411 or 121.412 to provide training, testing, and checking to persons subject to the requirements of this subpart.