thought experiment:
should tank be able to kill plane sitting still on runway? yes?
should tank be able to kill plane rolling at 20mph on runway? yes?
should tank be able to kill plane rolling at 60mph on runway? yes?
should tank be able to kill plane in air at 85mph, 5 feet above runway? yes?
should tank be able to kill plane in air at 100mph, 50 feet above runway? yes?
etc.
etc.
etc.
why anyone thinks planes should be invulnerable to tank fire is beyond me.
ps.
if it's happening to you all the time, you're flying in a very predictable manner.