Why don't aircraft have separate kill boundaries?

Title says it all. Battlefield had this down years ago. It’s ridiculous to see a Banshee spontaneousy explode because it got hit by a plasma pistol above the wrong area or flew too low while avoiding enemy fire.
I’m not saying banshees should be able to go wherever they please. You should, however, be able to intuit where your banshee will blow up instead of understanding the map’s hard kill boundaries through trial and error.