SPIRIT 1 & 2 are available and on-line.
Step 1: A login is required to access SPIRIT.
Step 2: Check the local weather conditions.
Step 3: Make a booking request here:
Note: The weekend booking deadline is Friday morning.
A calendar view can be found here: SPIRIT 1 & 2 Calendar
Step 4: On the night of your scheduled booking, you can access your booked telescope here: