My optimistic reading of the message is that it won't be a calendar day by calendar day extension, but rather based on the number of pass days that are lost due to the closure and extended by an equal number of pass days. For instance, if the parks happen to re-open April 1, a Southern California Select passholder will have lost 10 Monday to Thursday pass days when they could theoretically have gone to the park, so their pass would be extended by 10 pass days. So if their pass was set to expire May 31, in order to provide equal value with the summer blockouts, their pass would be extended all the way to September 1. By contrast, someone with a Signature or Signature Plus pass would simply get a calendar day extension. So my hope is that someone with a Flex Pass that is set to expire December 14 would have it extended past the Christmas blockout period.