14 CFR 211.14: Incorporation by reference.

Where two or more applications are filed by a single carrier, the applicant may incorporate lengthy exhibits, or other documents, attached to one application into others by reference. The applicant may not incorporate by reference and update any information from a previous docket unless submitted within the past 2 years. The applicant must identify the docket, and the page number or exhibit number being incorporated, and state that there has been no change in that information since submitting the original information.