1 Authorisation by ATC (1), for purpose of preventing collision between known aircraft, for aircraft to proceed under specified conditions within controlled airspace (see abbreviated *, SIDS, STARs, * delivery, * items, * limits).
2 Minimum gap between portions of hardware in relative motion (eg fan blade and case).
3 Transport of troops and material from beach, port or airfield using available communications.
4 Approval for publication of written text, image or film concerning sensitive subject, after excision of offending parts.


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