Clear Skies Airborne target Damage is Multiplicative and also applies to splash damage

Ravager tests Data

//target on land
  16      628.723 Max       336.219 Cur      380.519 Prev       44.300 Damage
   0      628.723 Max       297.120 Cur      336.219 Prev       39.099 Damage
//target floating
 469      314.362 Max       163.719 Cur      217.252 Prev       53.533 Damage
   0      314.362 Max       116.472 Cur      163.719 Prev       47.247 Damage

Lvl 9 Clear Skies OZ 21% airborne target damage
COM with ~17% SGun damage
BAR gun damage 3.83
BAR Grenade damage 3.83
card 36.784 pellet damage (with additive BAR & COM 44.300 )

// calculations
// vs target on ground
36,784 * ( 1 + 0,0383 + 0,1665) = 44.317 // impact
36,784 * 0,85 * ( 1 + 0,0383 + 0,1665) * ( 1 + 0,0383 ) = 39,1125 // splash

// vs airborne target
36,784 * ( 1 + 0,0383 + 0,1665) * 1,21 = 53,624 // impact
36,784 * 0,85 * ( 1 + 0,0383 + 0,1665) * ( 1 + 0,0383 ) * 1,21 = 47,326 // splash

Probably worth keeping one around for Jetfighter annoyances and definitely for airborne boss fights (RK5 ) …