Newgrf Airports Documentation
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This is a proposed spec only
Contents | 
Preamble
Airport Tiles
Airport tiles are the graphical component of the airport. They have no direct interaction or effect on the state machine on or aircraft.
Action 0 Airport Tiles
- Land shape flags (0D)
 - Animation information (0F)
 - Animation speed (10)
 
all as per Properties for industry tiles 0D, 0F and 10
Action 2 Airport Tiles
as per Action 2 for houses and industry tiles
Var Action 2 Airport Tiles
as per Variational Action 2 Variables for Industry Tiles, except of course "industry" -> "airport".
Callbacks for Airport Tiles
- Next animation frame (1A/26/141)
 - Animation control (1B/25/140)
 - Custom shape check (2F)
 - Decide drawing default foundations (30)
 - Disable autosloping for industry tiles (3C)