Fairy does ×1 to Flying

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

64 Fairy and 109 Flying species among the 1025 this site covers.

Attacker, Psychic and Fairy Hatterene sprite

damage×1Generations VI to IX

Defender, Psychic and Flying Lugia sprite

Lugia #0249

Fairy did not exist in Generation I and Generations II to V, so Fairy against Flying has no value there.

Strongest Fairy attackers

Hatterene leads Fairy at Sp. Atk 136

Sturdiest Flying defenders

Dual types that change the answer