S22 is still a long way away, even more so in the current climate.
Just a thought but perhaps it’s a result of 733/757 fleets being smaller/gone by S22, and they may also not have factored in any leased-in capacity as of yet as they probably want to be more cautious?
As I said, just something that came to mind, but may be completely wrong. Frankly S21 is still massively in doubt so I think everything needs to be taken with a pinch of salt. Hopefully though, by S22 we can get back to more normality and levels closer to S19.
Ultimately though, this pandemic is not only a health one, but also an economic one, and the true impact of the latter is still very much yet to be felt.