Originally Posted by
Swanhunter
That kind of availability pattern can also indicate uncertainty about whether the route will come back or continue.
It's this. It's every flight. in both directions in 2021. It's indicative of no decision made as to whether they will operate the route. Slot sitter in the schedule if you like. If you book at the higher fare and they pull it, they'll rebook you via CPT/JNB. If they sell £500 returns in Y and have to rebook they'll lose money.
Keep a look out until a decision is made, set up an alert.