Hello @Osullivan
I am sorry to learn you can no longer enjoy TV Air on your iPads. I know how you feel, I got the same surprise with my iPad mini 😞
Swisscom regularly increase the minimum supported version of mobile operating systems. We carefully decide based on various factors, such as customer engagement and technical factors. Legal or contractual criteria are involved too. For example, the movie studios don't provide certain content options below a specific version. For this last update, it was a combination of all these factors that led to the decision to remove support for iPhone 5c (2013) and older and iPad 4 (2012) and older.
I am sorry not to be able to give you a better answer.
Thank you for your understanding.