We've added an option to set a minimum booking interval for flights which gives you the flexibility to make a flight bookable up to X hours before departure.
This option can be set for a specific flight in the flight page:
For this example, where the flight departs at 11:00, setting the minimum booking interval to 3 will make this flight bookable up to 08:00. No further bookings can be made after 08:00 for this specific flight only.
Like all other flight settings, this can also be set to multiple flights via the "Flight series" screen.
The "Minimum booking interval" per flight is an addition to the minimum booking interval set on the "Destination" setup.