Aragorn

Aragorn is the winged steed of Brunnhilde.

Battle of Earth
Brunnhilde, one of the Valkyrie, rode Aragorn, her Valkyrie Steed, into the Battle of Earth, aiding the Avengers and their allies. Pepper Potts dropped Spider-Man onto the Steed to help him keep the Iron Gauntlet away from Thanos' forces.