Airliners arent hardened. Ball ammo will slice through its exterior like it was aluminium foil.
Even shedding through a section of wing...you wouldnt have to slice the wing off...just shooting through a section of it will bring it down...hydraulics, feul and electrical systems flow through an airliners wing.
An aweful thing considering the innocent life that would be lost but when you factor in the mathmatics of any impact on a major governmental facility and there isnt alot of drama...per se...you just do it.
Umm...I always thought aircraft exteriors WERE aluminum foil (well, kinda THICK foil, but not overly so).