Notable changes
- ISO-8601 date time for GTFS GraphQL API itinerary responses #5660
- Add support for query parameter to enforce booking time in trip search for flexible services #5606
- New GTFS GraphQL plan query #5185
- Make new debug client the default, move old one to
classic-debug#5924 #5962 #6012 #6053 - Disable Legacy REST API by default #5948
The full changelog is available at https://docs.opentripplanner.org/en/v2.6.0/Changelog/