M-Major
International airports of entry and departure where all formalities incident to Customs, Immigration, Health and similar procedures are carried out, and which are open to scheduled and
nonscheduled flights.
R-Restricted
International airports of entry and departure at which the formalities incident to Customs, Immigration, Health and similar procedures are made available on a restricted basis, to flights with
prior approval only.
A-Alternate
International airports specified in the flight plan to which a flight may proceed when it becomes inadvisable to land at the airport of intended landing.
N-Nonscheduled
International airports at which approval may be granted, provided the prescribed prior notice is given, for international nonscheduled flights only; no other form of international operation is
permitted.
E-External
International airports of entry and departure for international air traffic located in an administered territory, where all formalities incident to Customs, Immigration, Health and similar
procedures are available.
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