FHH

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Sanctioned Events. The Academy of Model Aeronautics sanctions the
following types of model activities. Flying activities include A, AA, AAA,
AAAA contests, Class B contests, Record Trials, National, and
International contests that are part of the AMATeam Selection program,
non-rule book events (Class C) including fly-ins, and demonstrations
classified as Class D. There will be no preferences or priorities extended to
any participant(s) on any geographical, organizational, cultural, or social
basis. Any such restrictions automatically relegate the activity to a B
classification. These activities will be conducted by licensed Contest
Directors according to these official regulations.
(Note: The National Aeromodeling Championships (Nats) shall be
identified by a AAAAA contest classification. Only one such competition
may be held in a given year. The Executive Council shall be the sole
determining authority, relative to whether the competition is held, the dates
of its operation, and the location.)

In general, on the same date, there should be at least the following distance
separating contests:
Class A . . . . . . . . . . . . . . . 100 miles
Class AA . . . . . . . . . . . . . .300 miles
Class AAA or AAAA . . . . 450 miles
(These distances should be scaled down in high population density areas
and should be scaled up in low population areas.)