I've made a patch that allows airports to be upgraded, that is, it allows to replace an airport in a station with another. It works much like railroad stations: you build a station over an existing one and the old one gets demolished. Specifically, to use this patch you must select an airport to be built and place it overlapping (partially or totally) an existing one, which will be removed and replaced atomically. The usual restrictions apply, so you must be on good terms with the local authority, the tiles to be used must be clear (except those belonging to the old airport), etc.
The advantages of this patch are:
- Easier interface: fewer clicks for the same job.
- Atomicity: the town no longer has a chance to build roads or buildings between removal and rebuilding of an airport (very annoying).
- Local authority ratings are checked before execution starts, so you won't find that you've demolished an airport and now the town authority doesn't allow you to replace it (nor to rebuild the old one).
I've found another patch
to this same end, but it's a bit old and no longer applies cleanly against trunk (and it seemed to have some problems), so I've coded a new one.
This patch can be coupled with my airport-close patch
for easiest replacing of airports.
EDIT: Current status:
Patches against: 0.6.0