14 CFR 1214.105 - Apportionment and/or assignment of services.
(a) Subject to NASA approval, a customer may apportion and/or assign Shuttle services to third parties within the payload. No apportionment and/or assignment of Shuttle services may take place outside the payload.
(b) Integration of apportioned/assigned payload elements within the payload is the responsibility of the customer. Any NASA assistance in such integration will be provided as an optional service.
(c) Customers intending to apportion and/or assign services will so designate at the time the launch agreement is signed.