Airspace ban should have been done but I see that Government may have some reasons to delaying as such or may be we are not much aware but one thing for sure is; there are International Players and a set of rule that direct ban without any plausible reason except that in protest of Kashmir, may not be acknowledged widely. Remember that we can't put such sanctions without any major reason like we had in Feb, 2019. I can be wrong in regard to legal obligations but to me, seems the case hence, government must be working on some thing in this regard for maximum pressure building.
The question is if Pakistan does not have diplomatic relations with Israel to support the cause of the Palestines why does Pakistan maintain diplomatic relations with India?
Does Pakistanis care more about Palestine than Kashmir?
I fully support Pakistan severing all relations with India with immediate effect.
Pakistan should sever all its relations with India, recall all Pakistan diplomats from India and withdraw from all bilateral agreements with India (Simla agreement, Lahore declaration etc.)
This step by Pakistan will end the position taken by India that all issues between India and Pakistan will be handled bilaterally.
Once Pakistan has no direct relations with India, then all matters between India and Pakistan will require mediation by majors powers of the world.
This means Kashmir issue would be internationalized by default.