We planned to visit Zion the next day, but were unable to obtain shuttle tickets. (Much of) the park is closed to private vehicles, and visitors enter & move about on shuttles.
Due to coronavirus regulations, every other row have been removed where they used to be packed to standing room only.
Since there are limited shuttle seats, they pre-sell these in advance - most are available two weeks out, and a handful are reserved for 24 hour advance purchase.
Somehow we missed the detail about the two week tickets and only tried to get them 24 hours out.
So on our first day, we logged in early and constantly refreshed when the NPS clock struck 9:00 AM. I selected a time window, and... SUCCESS! I had 15 minutes to make a payment or I lose them.
That’s when I noticed I only reserved one ticket. I tried to add more but they were already sold out. I searched the later blocks, but they were disappearing right before my eyes.
All of this happened by 9:00 and 15 seconds.
This was disappointing.