Annex 9 exists because a border crossed slowly is a border crossed expensively. Its standards strip the entry and departure of aircraft, crews, passengers, baggage and cargo down to the fewest documents and the fastest procedures compatible with each State's laws. The exam tests the documents by name: the general declaration, the crew member certificate, the passport-and-visa baseline, and the machinery that deals with the passenger a State refuses to admit.
The general declaration
The general declaration is the aircraft's own border document: a summary of the flight, presented outward and inward, carrying:
the operator
the aircraft's marks of nationality and registration
the flight number and date
the flight routing with every en-route stop
the names of the crew
the number of passengers on each stage
A State requiring it must limit its information demands to those elements and accept it in electronic or paper form; where it is required only for attestation, a formal confirmation that the flight's documents are in order, it must accept instead a statement added by hand or rubber stamp to one page of the Cargo Manifest, signed by the authorized agent or the pilot-in-command (the authorized agent being the person the operator empowers to act for it in these formalities). If the aircraft is not embarking or disembarking passengers, or lading or unlading cargo, stores or mail, the corresponding documents are not required at all: a notation on the general declaration replaces them. And no State may demand more than three copies of any of these documents.
Crew: entry and the crew member certificate
States shall establish measures to expedite the inspection of crew members and their baggage at departure and on arrival. The instrument built for this is the crew member certificate (CMC); the reason for it is a division of labour: the CMC is a card used for identification, leaving the crew licences to serve their primary purpose of attesting to the professional qualifications of the flight crew. A licence proves the holder can fly; the CMC proves who is standing at the immigration desk. Where States issue CMCs, they are issued only as machine readable cards to the specifications of Doc 9303, and only after a background check with controls on blank card stock and issuing personnel.
The acceptance rule is a Standard: States shall accept the CMC for visa-free entry of a crew member arriving in a duty status on an international flight and seeking temporary entry, for the period the receiving State allows: the certificate stands in the passport-and-visa's place. A Recommended Practice extends the waiver to a crew member arriving on another operator's aircraft, or by another mode of transport, to JOIN an assigned flight in a duty status: the positioning crew. And for the broken aeroplane itself, States shall provide for the temporary entry without delay of technical personnel urgently required to make an aircraft airworthy, when it cannot continue its journey for technical reasons.
Passengers and their baggage
The passenger baseline is deliberately short: States shall require no documents other than those provided for in Annex 9's travel-document chapter, and a visitor rightfully holding a valid passport recognised by the receiving State, and a valid visa where appropriate, may not be asked for any other document of identity. Passports are machine readable, issued separately to each person regardless of age; identity documents are, except in special circumstances, inspected only once at entry and once at departure; and no written baggage declaration is required when nothing dutiable or restricted is carried. The service target behind it all (a Recommended Practice, not a Standard): clearance of arriving passengers requiring no more than normal inspection within 45 minutes of disembarkation. Custody runs in a chain: the operator is responsible for disembarking passengers and crew from the moment they leave the aircraft until they are accepted for examination at the arrivals control point; from acceptance to admission the public authorities should take over, as a Recommended Practice, and the operator's responsibility ends definitively when the person is admitted.
Baggage separated from its owner travels on lighter paperwork than its owner did. States shall permit operators to:
forward mishandled baggage to its owner's location — without liability for penalties, fines, import duties or taxes.
transfer mishandled baggage directly between international flights — at the same airport, without examination (aviation security excepted, with secure temporary custody where direct transfer fails).
present unidentified, unclaimed or mishandled baggage for clearance — on behalf of its owners, and deliver it to them, with the clearance of such baggage, and its return to the operator, expedited.
The inadmissible person
When a State refuses entry, Annex 9 choreographs what happens next. The State notifies the operator without delay, confirming in writing, and issues a REMOVAL ORDER naming the inbound flight and, if known, the person's name, age, gender and citizenship, consulting the operator on a reasonable time frame for the removal. If the person's travel documents were lost, destroyed or seized, the State delivers a covering letter (with photocopies of any seized documents) that transit and destination States must accept as sufficient documentation for their examination; the operator (or the escort, where one is assigned) is responsible for delivering these papers at destination. A State expecting resistance to the removal warns the operator in advance so the flight's security can be prepared.
The costs and the destination follow two clean rules. The operator pays for the custody and care of an IMPROPERLY DOCUMENTED person from the moment they are found inadmissible and returned to it; the State pays for every other category of inadmissible person; and the operator may recover its transport costs from the person removed. Removal is to the point where the person's journey began, or to any place where they are admissible; and the State where the journey commenced must accept the person back for examination and may not bounce them onward to the State that refused them. One protection completes the design: no fines on operators who can demonstrate they took the necessary precautions to ensure their passengers' documents were in order.
The unruly passenger and the commander
Against the disruptive passenger, the pilot-in-command's authority comes from the Tokyo Convention of 1963, as module 1 taught it: from the moment the doors close, the commander may:
impose reasonable measures, including restraint, on reasonable grounds — to protect the safety of the aircraft and those on board.
require the assistance of crew members — and request that of passengers.
disembark the person — in any State where the aircraft lands.
deliver them to the competent authorities — for serious offences.
All with no liability for lawful measures taken. Annex 9 adds the facilitation layer: States promote awareness of the legal consequences of unruly behaviour and train relevant personnel to manage such situations.
Cargo
Cargo crosses the border on the manifest, not on ceremony: States accept the Cargo Manifest, in electronic or paper form, either completed in full or partially completed with a copy of each air waybill representing the cargo on board. As with all aircraft documents, no more than three copies may be demanded, with a document received electronically never demanded again on paper. No written declaration is required for stores remaining on board, and the equipment of air commerce moves freely: States grant temporary admission to containers and pallets, and to the replacement parts needed to repair those containers and pallets (the freight system's own hardware is not treated as an import), while an aircraft's own spare parts enter under a different door: relief from import duties under Article 24 of the Chicago Convention, with prompt release and clearance, because a part incorporated into an aircraft never stays in the country as goods.