When I'm traveling I often use TransitTimes+, rather than NextBus, the app that JTA has been testing for an eternity and promises to roll out with their revised network. (Why wait? Why not now?)
The Australian developers of TransitTimes+ invite users to request additional transit systems. The app is already available for Miami, Tampa, Orlando and oodles of systems around the planet. (Their website:
http://transittimesapp.com/).
So I requested they add JTA to their inventory of systems. Here's their reply:
It appears that at this time JTA do not make their developer data available to third-party developers such as myself.
Cheers
Quentin