Public transport and / or air transport directions ?

I see car directions have been added to the 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.

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