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Those under the affluence of incohol or drugs, unless prescribed by a qualified doctor.

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Persons of unsound mind or who may be a danger to the aircraft or persons therein.

"Walking Wounded", that is, passengers who are infirm due to age, ill health or otherwise, may be carried subject to the approval of the qualified medical personnel who should accompany and be responsible for them. No patients should be placed near emergency exits, and wheelchairs, etc. should not impede escape paths. If your Company does a lot of medical work, it may be worth retaining a doctor to advise on certain cases, especially where infectious diseases are concerned. Routes should be planned to take into account changes of altitude and rates of descent, and you will need to accelerate or decelerate with care.

Aside from the patient's condition, the consent of both referring and receiving hospitals is required, together with confirmed arrangements for road transport at the departure and destination airports. You also need to make sure that the type of aircraft is what is wanted, together with the details of staff and equipment.
 Specialised equipment should be properly installed, and instructions must be available to all attendants. Some of it could actually be classed as Dangerous Goods (say, large quantities of Aeromedical Oxygen), so you may need an exemption to carry it. Anything that needs to be fixed to the aircraft (e.g. stretchers), or connected to its systems, must be through an approved system, as it must be compatible with the aircraft environment (for instance, that used in road ambulances may be unsuitable for flight).
Oxygen (if used) must cover the duration of loading, flight, technical stops and unloading, plus about 1 . hours’ reserve for eventualities.
Patients who can sit should occupy a seat and use a seat belt, which may be a little looser than normally required, except for take-off, landing, flight in turbulence or during manoeuvres. Stretcher patients should be secured by belts or a harness as per the Flight Manual. Other passengers must be limited to whatever seats are left after stretchers have been fitted.
Flight attendants must have proper experience, and doctors must be qualified and registered in the States concerned in the move. In fact, a doctor is always required on ICT flights and on ATT flights which are other than simple escort cases.
Nurses must also be registered in the relevant States and work under direct instructions of an accompanying doctor (or apply those given before flight by one). Nurses must not be used on their own on ICT flights or with any possibility of the patient's condition changing. Paramedics may be employed with the agreement of the patient's doctor. Their training may not be valid in some States.

Pleasure Flying
The idea behind this is to carry groups of people, generally members of the public who have never flown before, for a short period, which can be anything from three to fifteen minutes, depending on whether you’re just going round a local show, the Niagara Falls (9 minutes) or mountains (here, we’re more concerned with the former, which tends to take place on a more informal basis. Also, the dimensions for sites given here are largely applicable to UK, but are still good to use elsewhere).