Yes Availability is based on ride demands and weather.
Six Flags is generally busy almost all the time, especially during the summer, but a Monday would be your best bet if you want to not have a crowd, plus the Flash Pass would definitely help out a lot.
Yes
depends on how hot it is
Tuesdays and Thursdays are normally the lease busy, but they are ALWAYS packed. If you ride a lot of rides, yes the flash pass would be worth it. However if you get their early, you can probably ride all your favorites before it gets to crowded
During the summer it seems to be packed all the time. I recommend at least getting the cheapest one.
Yes, I think they are
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