Public transport and / or air transport directions ?

I see car directions have been added to the openstreetmap.org site. Is there enough interest in public transport directions, with or without air transport, to warrant adding it ? I happen to have developed public transport routing software that I am happy to deploy for OSM.

Joris,
I’ve not seen much activity from anyone involved with the osm.org website here, so I’d suggest asking somewhere else, such as the “dev” mailing list or #osm-dev on IRC.