<P> Article 13: (Entry and Clearance Regulations) A state's laws and regulations regarding the admission and departure of passengers, crew or cargo from aircraft shall be complied with on arrival, upon departure and whilst within the territory of that state . </P> <P> Article 16: The authorities of each state shall have the right to search the aircraft of other states on landing or departure, without unreasonable delay . </P> <P> Article 24: Aircraft flying to, from or across, the territory of a state shall be admitted temporarily free of duty . Fuel, oil, spare parts, regular equipment and aircraft stores retained on board are also exempted from customs duty, inspection fees or similar charges . </P> <P> Article 29: Before an international flight, the pilot in command must ensure that the aircraft is airworthy, duly registered and that the relevant certificates are on board the aircraft . The required documents are: </P>

What type of aircraft is excluded from coverage under the chicago convention