Flying does ×½ to Steel

Generations VI to IX, single types. The other way round, Steel against Flying, is ×1.

109 Flying and 65 Steel species among the 1025 this site covers.

Attacker, Dragon and Flying Rayquaza sprite

damage×½Generations VI to IX

Defender, Steel and Ground Steelix sprite

Steelix #0208

Steel did not exist in Generation I, so Flying against Steel has no value there.

Strongest Flying attackers

Rayquaza leads Flying at Atk 150

Sturdiest Steel defenders

Dual types that change the answer