Got an email this morning from Six Flags.
They are extending all 2020 season pass holders to have their passes expire December 31, 2021.
Additionally, if you purchased an all season dining or flash pass, those are also being extended until the end of next year.
I was certainly not expecting either, but especially not the latter. So great job on Six Flags; who corporately (not operationally) have handled this thing pretty dang well between the reservations, entrance into parks, etc.